| Nom | Prénoms | M/F | Lieu de naissance | Date de naissance | Pays |
| OANH | Luvan | M | Vinh Loc | 1919/10/10 | VN |
| OBBADONE | Jacques | M | Val della torre (TO – Piemont) | 1857/04/02 | I |
| OBERDORF | Jakob | M | Zillisheim (Haut-Rhin - France) | 1876/02/18 | Als |
| OBERER | Emilie | F | Sissach | 1883/09/05 | CH |
| OBERFELD | Marie Alice | F | Besançon (Doubs – France) | 1881/06/30 | I |
| OBERHOLZER | Emile | M | Wald (3 communes) | 1906/08/29 | CH |
| OBERHOLZER | Jean Jacques Jules | M | Kaltinger (Suisse) | 1862/11/22 | CH |
| OBERLÉ | André | M | Dimbstahl (Bas-Rhin) | 1865/03/27 | D |
| OBERLIN | Amélie | F | Jebsheim | 1890/03/27 | D |
| OBERLY | Paul Ulysse | M | Locle (Le) (canton de Neuchâtel) | 1886/10/20 | CH |
| OBERRIEDER | Emma | F | Beblenheim (Hte Alsace) | 1865/03/22 | Als |
| OBERSON | Alphonse | M | Pont-la-Ville (canton de Fribourg) | 1887/12/26 | CH |
| OBERSON | Firmin Félicien | M | Romont-la-Côte (canton de Fribourg) | 1882/06/06 | CH |
| OBERSON | François | M | Farvagny (canton de Fribourg) | 1876/07/05 | CH |
| OBERSON | Léon | M | Bussières (Haute-Savoie - France) ? | 1884/10/04 | CH |
| OBERT | Léon Marie Amédée | M | Rhêmes Saint Georges (AO - Val D'Aoste) | 1885/07/07 | I |
| OBERTI | Antoine | M | Piazza-Bembrana (BG – Lombardie) | 1857/00/00 | I |
| OBERTI | Baptiste | M | Piazza-Bembrana (BG – Lombardie) | 1850/12/18 | I |
| OBERTI | Jean | M | Piazza-Bembrana (BG – Lombardie) | 1830/00/00 | I |
| OBERTINO | Dionis Secondino Sévérino | M | Sparone (TO - Piemont) | 1893/12/21 | I |
| OBERTINO | Emile Joseph | M | Labergement Ste-Marie (Doubs – France) | 1924/03/17 | I |
| OBERTINO | Georgette Ginette Gilberte | F | Labergement Ste-Marie (Doubs – France) | 1928/12/01 | I |
| OBERTINO | Gilbert Raymond | M | Labergement Ste-Marie (Doubs – France) | 1928/01/26 | I |
| OBERTINO | Jean Louis | M | Sparone (TO - Piemont) | 1898/08/25 | I |
| OBERTINO | Marcelle Irène | F | Labergement Ste-Marie (Doubs – France) | 1929/05/14 | I |
| OBERTINO | Raymond | M | Labergement Ste-Marie (Doubs – France) | 1925/07/07 | I |
| OBERTINO | Simone | F | Labergement Ste-Marie (Doubs – France) | 1925/06/17 | I |
| OBERTO | François | M | Rivarolo Canavese (TO – Piemont) | 1858/00/00 | I |
| OBERTO | Giovanni | M | Cornier (Haute-Savoie – France) | 1893/05/16 | I |
| OBERTO | Michel | M | Rivarossa (TO - Piemont) | 1854/02/05 | I |
| OBI | Fritz | M | Oberbipp (canton de Berne) | 1897/10/28 | CH |
| OBOROCEANU | Georges | M | Dumbraveni | 1892/07/26 | RO |
| OBRECHT | Maria Salomé | F | Horburg | 1884/01/02 | D |
| OBRECHT | Marie | F | Horbourg (Alsace) | 1870/10/28 | Als |
| OBRECHT | Marie Madeleine | F | Horbourg (Alsace) | 1868/07/21 | Als |
| OBRY | Victor Michel | M | Labaroche (Alsace) | 1847/04/14 | D |
| OBTULOWIECZ | Victoire | F | Sposysz | 14/08/1905 | PL |
| OCCIONI | Emma | F | Mandeure (Doubs – France) | 23/08/1909 | I |
| OCHLER | Jean | M | Nordrach (Land de Bade-Wurtemberg) | ? | D |
| OCHMANN | Edwige | F | Bollwiller (Haut-Rhin – France) | 1926/12/25 | PL |
| OCHSLI | Jacob | M | Fraubrunnen (Berne) | 1870/05/22 | CH |
| OCHSNER | Hermann Emmanuel | M | Brassus (Le) (canton de Vaud) | 1886/09/09 | CH |
| OCHSNER | Otto Arnould | M | Brassus (Le) (canton de Vaud) | 1884/07/24 | CH |
| OCKER | Eugène | M | Ribeauvillé (Haut-Rhin – France) | 1868/06/24 | D |
| OCKOCINSKI | Léopold Stanislas | M | Alexandroff | 1920/04/24 | PL |
| OCKOCINSKI | Vincent | M | Alexandroff | 1894/05/02 | PL |
| OCLEPO | Patrino | M | Pavone Canavese (TO – Piémont) | 1871/03/22 | I |
| ODERBERG | Mordka Wolfa dit Marcus | M | Knentzine (Pologne) | 1882/10/18 | PL |
| ODIET | Paul Alcide | M | Hérimoncourt (Doubs) | 1893/04/22 | CH |
| ODIN | Athanase | M | Montagny-les-Monts (canton de Fribourg) | 1895/06/06 | CH |
| ODIN | Gaspard | M | Neyruz (canton de Fribourg) | 1851/02/06 | CH |
| ODIN | Zotique | M | Montagny-les-Monts (FR) | 1888/03/25 | CH |
| ODONETTO | Laurent Georges | M | Cuorgné (TO - Piemont) | 1890/07/15 | I |
| ODORICE | Carlo | M | Modene (MO – Emilie-Romagne) | 1870/11/24 | I |
| ODORICI | Domenico | M | Guiglia (MO – Emilie-Romagne) | 1891/04/26 | I |
| ODORIZZI | Antonio | M | Bollone (BS - Lombardie) | 1866/00/00 | A |
| ODY | Valentine Hélène | F | Arc-sous-Cicon (Doubs – France) | 1896/04/18 | USA |
| OECHSLIN | Frédéric | M | Fraubrunnen (Suisse) | 1844/02/23 | CH |
| OEHLER | Emma Frida | F | Lehrohof | 1884/05/01 | D |
| OERTLE | Jakob | M | Roggwil (2 communes) | 1901/09/26 | CH |
| OESCH | Albert Louis | M | Oberlangenegg (canton de Berne) | 1873/06/13 | CH |
| OESCH | Frédéric | M | Thoune (canton de Berne) | 1870/07/20 | CH |
| OESCHLIN | François Louis | M | Schaffhouse (canton de Schaffhouse) | 1845/06/22 | CH |
| OESH | Anna Emilie | F | Thun | 1883/12/26 | CH |
| OESH | Ida Marie | F | Thun | 1886/12/27 | CH |
| OEUVRAY | Alfred Paul Marcel | M | Bure (canton du Jura) | 06/07/1911 | CH |
| OEUVRAY | Pierre Paul | M | S. Ursanne | 1873/09/07 | CH |
| OEXLEN | Martin | M | Einsiedeln (Schwytz) | 1869/02/25 | CH |
| OFFENER | Pierre | M | Planfayon (canton de Fribourg) | 1912/02/17 | CH |
| OFFENER | Raymond | M | Planfayon (canton de Fribourg) | 1890/12/30 | CH |
| OFFENHAUSER | Ernest Isaac | M | Sarraz (La) (canton de Vaud) | 1867/00/00 | CH |
| OFFERLE | Emile | F | Baldenheim (Alsace) | 1873/06/07 | Als |
| OFFIGI | Thérèse Louise | F | Tancua (Jura - France) | 29/08/1907 | I |
| OFFMANN | Jean | M | Schwenheim (Bas-Rhin - France) | 1885/00/00 | Als |
| OFFNER | Louis | M | Planfayon (canton de Fribourg) | 1893/07/03 | CH |
| OFFREDI | Battista | M | Berbenno (BG - Lombardie) | 1872/12/12 | I |
| OFFREDI | Charles | M | Peghera di Taleggio (BG - Lombardie) | 1912/09/18 | I |
| OFFREDI | François Baptiste | M | Berbenno (BG - Lombardie) | 1854/00/00 | I |
| OFFREDI | Giacomo | M | Taleggio (BG - Lombardie) | 1894/09/18 | I |
| OFFREDI | Giuseppe | M | Taleggio (BG - Lombardie) | 1893/12/26 | I |
| OFFREDI | Judith | F | Taleggio (BG - Lombardie) | 1887/10/03 | I |
| OFFREDI | Pietro | M | Gerosa (BG - Lombardie) | 1897/12/27 | I |
| OFFREDI | Valentino Ignazio | M | Brumano (BG - Lombardie) | 1909/01/31 | I |
| OFLINGER | Charles | M | Hochstatt (Haut-Rhin) | 1857/05/06 | D |
| OFRANDI | Fermo | M | Fino del Monte (BG - Lombardie) | 1870/05/26 | I |
| OGGERI | Giacomo | M | Rueglio (TO - Piemont) | 1862/08/08 | I |
| OGGERO | Hubert Angel | M | Acquanegra Cremonese (CR - Lombardie) | 1873/07/11 | I |
| OGGIANI | Jean Baptiste | M | Seppiana (NO - Piemont) | 1863/00/00 | I |
| OGLIARI | Eugène | M | Trescore Balneario (BG – Lombardie) | 1876/12/30 | I |
| OGLIARO | Marius | M | Ceretto Castello (VC – Piemont) | 1883/11/20 | I |
| OGLIOTTI | Secondo | M | Masserano (VC - Piemont) | 1849/01/19 | I |
| OHL | Anna Alphonsine | F | Strasbourg (Bas-Rhin – France) | 1841/08/08 | D |
| OHLMANN | Antoine | M | Haguenau (Bas-Rhin) | 1853/11/03 | D |
| OHMANN | Sébastien Xavier | M | Soulzmatt (Hte Alsace | 1871/02/03 | Als |
| OKENFUSS | Louis | M | Bohlsbach (Land de Bade-Wurtemberg) | 1831/00/00 | D |
| OLANDINI | Pio | M | Corniglio (PR – Emilie-Romagne) | 1895/08/27 | I |
| OLBRYCK | Stanislas | M | Krusplus | 1878/09/05 | PL |
| OLCHALSKI | David | M | Kowna (Russie) | 1843/05/28 | RUS |
| OLCHAWA | Joseph | M | Gabon | 23/06/1903 | PL |
| OLDANI | François | M | ? | 1897/07/31 | I |
| OLDANI | Giuseppe | M | Santo Stefano Ticino (MI - Lombardie) | 1886/06/07 | I |
| OLDANI | Henrico | M | Casorezzo ? | 0000/05/15 | I |
| OLEGGINI | Alfred | M | Veruno (NO - Piemont) | 1902/10/22 | I |
| OLEGGINI | Virginie Ernestine | F | Veruno (NO - Piemont) | 1896/04/07 | I |
| OLEGGINI | Antonio | M | Agrate Conturbia (NO - Piemont) | 1892/12/10 | I |
| OLEJNICEK | Stéfanie Rosa Wilhelmine | F | Vienne | 1921/02/24 | A |
| OLEJNICK | Roman | M | Erquy 22 | 1923/01/31 | PL |
| OLINGER | Marie | F | Mondorff-les-Bains | 1847/04/03 | L |
| OLIOTY | François | M | Masserano (BI – Piemont) | 1847/10/14 | I |
| OLIS | Willard | M | Poplarridge (USA) | 1894/06/27 | USA |
| OLIVA | Carlo | M | Mergozzo (NO - Piemont) | 1900/10/17 | I |
| OLIVA | Félix | M | Giaveno (TO - Piemont) | 1860/00/00 | I |
| OLIVA | Joseph | M | Bizerte | 04/08/1904 | TN |
| OLIVA | Sévérino | M | Coazze (TO - Piemont) | 1899/10/15 | I |
| OLIVA | Angela | F | Valle di Cadore (BL – Vénétie) | 1877/08/23 | I |
| OLIVARES | Angelo | M | Vittuone (MI - Lombardie) | 1894/09/25 | I |
| OLIVARI | Adelmo | M | Guiglia (MO – Emilie-Romagne) | 1892/04/02 | I |
| OLIVARI | Vito | M | Zocca (MO – Emilie-Romagne) | 1883/06/15 | I |
| OLIVER | François | M | Morez (Jura - France) | 1905/11/29 | E |
| OLIVER | Jacques | M | Soller | 1876/00/00 | E |
| OLIVERO | André | M | Marseille (Bouches-du-Rhône – France) | 1860/11/11 | I |
| OLIVERO | Antonio | M | Mazzè (TO - Piemont) | 1887/08/22 | I |
| OLIVERO | Carlo Andréa | M | Mazze (TO - Piemont) | 1879/10/08 | I |
| OLIVERO | Charles François | M | Saint-Blaise (canton de Neuchâtel) | 1862/08/25 | CH |
| OLIVERO | Oreste | M | Condove (TO - Piemont) | 1870/00/00 | I |
| OLIVERO | Pietro | M | Turin (TO - Piemont) | 1896/05/10 | I |
| OLIVERO | Salvatore | M | Sommariva del Bosco (CN - Piemont) | 1860/12/31 | I |
| OLIVERO | Ernesto | M | Sommariva del Bosco (CN – Piemont) | 1886/07/24 | I |
| OLIVETTI | Edouard | M | Traves (TO - Piemont) | 1899/10/19 | I |
| OLIVETTI | Pietro | M | Traves (TO - Piemont) | 1888/09/21 | I |
| OLIVI | Agostino | M | Urbania (PU - Marches) | 1895/04/03 | I |
| OLIVIER | Jean Jacques Marc | M | Crans-près-Céligny (canton de Vaud) | 1797/12/04 | CH |
| OLIVIER | Samuel | M | Eysins (canton de Vaud) | 1868/12/17 | CH |
| OLLIGINI | Edouard | M | Agrate Conturbia (NO – Piemont) | 1863/06/14 | I |
| OLOCCO | Antonio | M | Cereole d'Alba | 1884/12/14 | I |
| OMACINI | Elisabeth | F | Nese ? | 1898/04/02 | I |
| OMAR | Edoïno | M | Valleve (BG - Lombardie) | 1903/11/17 | I |
| OMENETTO | Tranquillo | M | Albettone (VI - Vénétie) | 1906/05/05 | I |
| OMER | Jean | M | Interlaken (canton de Berne) | 1841/08/15 | CH |
| OMICINI | Giacomo | M | Tione di Trento (TN - Trentin Haut-Adige) | 1859/00/00 | A |
| OMICIOLI | François | M | Urbino (PU - Marche) | 1847/09/11 | I |
| OMMERLI | Frédéric | M | Wagenhausen (Suisse) | 1880/09/21 | CH |
| OMMICIOLI | Ridolfo | M | Urbino (PU - Marche) | 1887/05/28 | I |
| ONESTI | Edmond | M | Bussoleno (TO - Piemont) | 1907/01/12 | I |
| ONGANIA | Alfred | M | Buenos-Aires (Argentine) | 1892/10/24 | I |
| ONGANIA | Angelo | M | Perledo (CO - Lombardie) | 1887/02/22 | I |
| ONGARO | Ange Louis Baptiste | M | Gandino (BG – Lombardie) | 1850/00/00 | I |
| ONGARO | Guerino Tranquillo | M | Isola Vicentina (VI - Vénétie) | 24/03/1901 | I |
| ONLEVEY | Henri Eugène | M | Grancour (Suisse) | 1867/11/04 | CH |
| OPPENHEIM | Louise Jeanne | F | New-York | 1883/05/14 | USA |
| OPPICI | Joseph | M | Parme (PR – Emilie-Romagne) | 1894/09/25 | I |
| OPPLIGER | Irma | F | Renan (canton de Berne) | 1897/12/10 | CH |
| OPRANDI | Joseph | M | Cerete (BG - Lombardie) | 11/02/1902 | I |
| OPTALE | Torquato | M | Agostini | 1885/10/24 | I |
| ORAVSKY | Rudolf | M | Pudlow (Pologne) | 1924/08/21 | CZ |
| ORCINGHER | Angelo | M | Canale D'Agordo (BL - Vénétie - Italie) | 1857/05/27 | A |
| OREGIA | Pierre | M | Pila (NO - Piemont) | 1851/04/11 | I |
| OREKOFF | Vitaly | M | Novos-Vikolavski | 1910/03/17 | RUS |
| ORESKOVITCH | Vidi | M | Progoz | 1892/03/16 | SRB |
| ORGARD | Henri | M | Sailly (Ardennes) | 1821/12/07 | ? |
| ORGEAS | Louis Jean | M | Tancua (Jura - France) | 23/04/1911 | I |
| ORGEAT | Jean | M | Turin (TO - Piemont) | 1891/10/18 | I |
| ORGEAT | Jean | M | Trana (TO - Piemont) | 1836/06/00 | I |
| ORGEAT | Louis | M | Cumiana (TO - Piemont) | 1881/10/23 | I |
| ORGIAS | Joséphine | F | Pinerolo (TO - Piemont) | 1873/03/19 | I |
| ORGIAZZI | Giosué | M | Cravagliana (VC – Piémont) | 1867/00/00 | I |
| ORGIAZZI | Henri | M | Cravagliana (VC - Piemont) | 1893/06/24 | I |
| ORGIAZZI | Jacques | M | Cravagliana (VC - Piémont) | 1851/11/20 | I |
| ORGIAZZI | Jean Baptiste | M | Cravagliana (VB - Piemont) | 1892/06/26 | I |
| ORGIAZZI | Michele | M | Cravagliana (VC - Piemont) | 1901/09/11 | I |
| ORGLER | Elsa | F | Berlin | 12/12/1910 | D |
| ORIEZ | Alfred Léonard | M | Vendlincourt (Suisse) | 1879/03/10 | CH |
| ORIGLIASSO | Dominico | M | Coassolo Torinese (TO - Piémont) | 1831/02/12 | I |
| ORIOLI | Emile | M | Borghi (FO - Emilie-Romagne) | 1892/09/27 | I |
| ORIOLI | Gualtiero | M | Borghi (FO - Emilie-Romagne) | 30/09/1922 | I |
| ORIOLI | Henri Adelman | M | Dampierre-les-Bois (Doubs – France) | 10/02/1932 | I |
| ORIOLI | Lino | M | Borghi (FO - Emilie-Romagne) | 21/05/1920 | I |
| ORIOLI | Valda | F | Dampierre-les-Bois (Doubs – France) | 18/02/1927 | I |
| ORLANDI | Angelo | M | Fanano (MO – Emilie-Romagne) | 1873/05/16 | I |
| ORLANDI | Fulgence | M | Villa Argine ? | 1857/00/00 | I |
| ORLANDI | Gaétano | M | Vergato (BO - Emilie-Romagne) | 1876/09/30 | I |
| ORLANDI | Giacomo | M | Novare (NO - Piemont) | 1881/00/00 | I |
| ORLANDI | Giuseppe | M | Pratovecchio (AR - Toscane) | 1899/03/12 | I |
| ORLANDI | Pietro | M | Palanzano (PR – Emilie-Romagne) | 1885/07/19 | I |
| ORLANDINI | Angelo | M | Pelago (FI - Toscane) | 1880/10/29 | I |
| ORLANDINI | Claudine Marie | F | St Claude (Jura - France) | 21/06/1902 | I |
| ORLANDINI | Dominique Antoine | M | Fanano (MO - Emilie-Romagne) | 1873/05/30 | I |
| ORLANDINI | Eglantine | F | Cusey (Haute-Marne - France) | 25/12/1903 | I |
| ORLANDINI | Elvire Marie | F | Corniglio (PR - Emilie-Romagne) | 1890/06/04 | I |
| ORLANDINI | Elviro | M | Corniglio (PR – Emilie-Romagne) | 1890/06/04 | I |
| ORLANDINI | Flora Rosieri | M | Lézat (Jura - France) | 17/07/1907 | I |
| ORLANDINI | Fulgence | M | Villa d'Adige (RO - Vénétie) | 1857/00/00 | I |
| ORLANDINI | Joséphine | F | Lézat (Jura - France) | 02/10/1908 | I |
| ORLANDINI | Léa | F | Crillat (Jura - France) | 28/05/1905 | I |
| ORLANDINI | Paridi | M | Vigatto (PR – Emilie-Romagne) | 1891/11/09 | I |
| ORLANDINI | Remizio | M | Corniglio (PR – Emilie-Romagne) | 1887/03/08 | I |
| ORLANDINI | Santinio | M | Corniglio (PR – Emilie-Romagne) | 1885/12/12 | I |
| ORLANDO | Bartolo | M | Campolongo (3 communes) | 1896/06/18 | I |
| ORLANDO | Jean | M | Ornans (Doubs - France) | 1927/07/30 | I |
| ORLANDO | Lazzaro | M | Cagliari (CA - Sardaigne) | 1884/11/19 | I |
| ORLANDO | Léonard | M | Valstagna (VI - Vénétie) | 1876/12/14 | I |
| ORLANDO | Juliette | F | Selargius (CA - Sardaigne) | 1914/01/07 | I |
| ORLER | Lino | M | Porto (10 communes) | 1920/01/03 | I |
| ORNATI | Giuseppe | M | Turin (TO - Piemont) | 1884/09/01 | I |
| ORNY | Louis | M | Bonnétage (Doubs) | 1861/08/05 | CH |
| ORO | Maria | F | Foza (VI - Vénétie) | 1868/10/08 | I |
| ORRI | Battista | M | Nogoro ? | 1886/08/11 | I |
| ORRU | Giuseppe | M | Jerzu (NU - Sardaigne) | 1889/11/11 | I |
| ORSI | Giuseppe Giorgio | M | Tizzano Val Parma (PR - Emilie-Romagne) | 1901/06/04 | I |
| ORSI | Hercule Clovis | M | Praduro e Sasso (BO - Emilie-Romagne) | 1898/04/14 | I |
| ORSI (d') | Louis | M | Tizzano val Parma (PR – Emilie-Romagne) | 1878/06/27 | I |
| ORSINI | André | M | Tavoleto (PS - Marches) | 1892/09/20 | I |
| ORSO | Giacomo | M | Frassinetto (TO - Piemont) | 1890/06/07 | I |
| ORSO | Louis | M | Salto (TO - Piemont) | 1875/11/29 | I |
| ORSONI | Georges | M | Salto (TO - Piemont) | 1875/11/09 | I |
| ORSUN | François | M | Finestrat (Province d'Alicante) | 1877/10/15 | E |
| ORTALDI | Jean François Jacques | M | Chivasso (TO - Piemont) | 1851/09/05 | I |
| ORTELLI | Agostino | M | Plesio (CO - Lombardie) | 19/03/1902 | I |
| ORTELLI | Battista | M | Plesio (CO - Lombardie) | 1905/05/01 | I |
| ORTELLI | Ercole | M | Loveno di Menaggio (CO - Lombardie) | 06/11/1903 | I |
| ORTELLI | Palmiro | M | Loveno sopra Menaggio (CO -Lombardie) | 1876/04/08 | I |
| ORTIZ LLORCA | Tomas | M | Archeta (province d'Alicante) | 1880/07/13 | E |
| ORTLIEB | Antoine | M | Neuchâtel (canton de Neuchâtel) | 1867/07/03 | CH |
| ORTLIEB | Catherine | F | Ostheim (Haut-Rhin) | 1863/11/12 | D |
| ORTOLAN | Marie | F | Bevilacqua (VR - Vénétie) | 04/10/1901 | I |
| ORTOLANI | Primo | M | San Severino (3 communes) | 1887/00/00 | I |
| ORTORE | Charles | M | Valprato (TO - Piemont) | 1895/09/26 | I |
| ORTOVOSKI | Antonio | M | Jeredine Galicie | 1886/04/15 | A |
| ORTOWAKI | Antoine | M | Seredno | 1887/07/26 | PL |
| ORTUNO | Enrique | M | Finestrat (Province d'Alicante) | 1899/04/15 | E |
| ORTUNO LLINES | Miguel | M | Orchet (Province d'Alicante) | 1890/09/18 | E |
| ORUZA | Natale | M | Piasco (CN - Piémont) | 1874/09/08 | I |
| ORVALE | Emile | M | Bierg | 1888/03/04 | E |
| ORVATTI | Jean | M | Monte Carasso (canton du Tessin) | 1857/05/25 | CH |
| ORY | Catherine | F | Dilligen | 1898/11/27 | D |
| ORZECHOWSKI | Jean | M | Bystrzyca | 14/09/1905 | PL |
| ORZI | Luigi | M | Bologne (BO – Emilie-Romagne) | 1883/10/14 | I |
| OSER | Xavier | M | Biederthal (Haut-Rhin) | 1857/08/01 | D |
| OSINSKI | Basia | M | Lubarton | 14/11/1903 | PL |
| OSIOUSKI | André | M | Dobkowice | 13/10/1910 | PL |
| OSIOWSKI | Nicolas | M | Dobkowice | 15/12/1912 | PL |
| OSIOWSKI | Pierre | M | Dobkowiec | 29/05/1915 | PL |
| OSKOLKOFF | Boris | M | Moscou | 1889/06/23 | RUS |
| OSLER | Numa Arthur | M | Chaux de Fonds (La) (canton de Neuchatel) | 1891/01/05 | CH |
| OSOLA | Gaspard | M | Rivarossa (TO - Piemont) | ? | I |
| OSSEMOND | Fabiano Petronio | M | Turin (TO - Piemont) | 1847/00/00 | I |
| OSSEMOND | Pierre | M | Ornans (Doubs - France) | 1883/04/22 | I |
| OSSETTE | Marie Claude | F | Rougemont-le-Château (Territoire de Belfort – France) | 1882/10/28 | I |
| OSSOLA | Attilio | M | Leggiuno (BG – Lombardie) | 1883/08/15 | I |
| OSSOLA | César | M | Introbio (CO - Lombardie) | 16/10/1907 | I |
| OSSOLA | Charles Louis Antoine | M | San Carlo (province de Turin) ? | 1874/08/13 | I |
| OSSOLA | Marie | F | Célina (BL - Vénétie) | 1895/12/01 | I |
| OSSOLA | Marie | F | Célina (BL - Vénétie) | 1895/12/01 | I |
| OST | Francisca | F | Ohlungen (Bas-Rhin – France) | 1878/03/06 | Als |
| OSTAPIW | Micheline | F | Patahicze | 31/10/1916 | PL |
| OSTERERO | Joseph | M | Giaveno (TO - Piemont) | 1874/00/00 | I |
| OSTERERO | Louis Félix | M | Giaveno (TO - Piemont) | 1882/00/00 | I |
| OSTERGAARD | Ludwig Christien | M | Borguire (Danemark) | 1875/06/13 | D |
| OSTERMANN | Ernest | M | Neuchâtel (canton de Neuchâtel) | 1880/07/15 | CH |
| OSTERMANN | Ernest Edouard | M | Neuchâtel (canton de Neuchâtel - Suisse) | 1882/07/15 | D |
| OSTERMANN | Guillaume | M | Hummersen | 1885/01/23 | Als |
| OSTERMEYER | Léon Emile Joseph | M | Moutier (canton de Berne) | 1876/07/06 | CH |
| OSTERTAG | Marie Louise | F | Fribourg (canton de Fribourg) | 1868/12/11 | CH |
| OSTI | Emmanuel | M | Ospedaletto | 1877/04/30 | A |
| OSTI | Pierre | M | Ospedaletto | 1870/11/19 | A |
| OSTINELLI | Giovanni | M | Milan (MI - Lombardie) | 1874/05/15 | I |
| OSTORERE | Dominique | M | Giaveno (TO - Piemont) | 1874/06/00 | I |
| OSTORERO | Constantin Félix | M | Giaveno (TO - Piemont) | 1877/10/17 | I |
| OSTORERO | Eugène | M | Coazze (TO - Piemont) | 1874/01/02 | I |
| OSTORERO | Giovanni | M | Coazze (TO - Piémont) | 1904/06/06 | I |
| OSTORERO | Jean | M | Giaveno (TO - Piemont) | 1862/06/25 | I |
| OSTORERO | Jean Baptiste Auguste | M | Saint-Claude (Jura) | 1888/01/01 | I |
| OSTORERO | Joseph | M | Coazze (TO - Piemont) | 1849/03/00 | I |
| OSTORERO | Joseph | M | Coazze (TO - Piemont) | 1879/09/14 | I |
| OSTORERO | Louis | M | Coazze (TO - Piemont) | 1863/00/00 | I |
| OSTORERO | Mario Marcello | M | Coazze (TO - Piemont) | 1892/02/01 | I |
| OSTORERO | Michel | M | Giaveno (TO - Piemont) | 1849/09/27 | I |
| OSTORERO | Pierre | M | Coazze (TO - Piemont) | 1850/00/00 | I |
| OSTORERO | Sévère | M | Coazze (TO - Piemont) | 1880/08/04 | I |
| OSTORERO | Sévère | M | Giaveno (TO - Piemont) | 1878/10/05 | I |
| OSTORERO | Vincent Joseph | M | Giaglione (TO - Piemont) | 1879/06/27 | I |
| OSWALD | Alphonse | M | Issenheim | 1887/04/30 | D |
| OSWALD | Jean | M | Hâggenschwil (canton de St Gall) | 1876/10/15 | CH |
| OSWALD | Marie Alfonsine | F | Colmar (Alsace) | 1884/02/02 | Als |
| OSWALD | Michel | M | Schnaus (canton des Grisons) | 1832/02/13 | CH |
| OSYNACH | Augusta | F | Cériale (SV - Ligurie) | 1902/11/02 | I |
| OTELLI | Giuseppe | M | Arvogne ? | 1895/07/23 | I |
| OTHENIN GIRARD | Louis Constant | M | Chaux de Fonds (La) (canton de Neuchatel) | 1856/04/08 | CH |
| OTHENIN GIRARD | Louise Cécile | F | Les Brenets (canton de Neuchâtel) | 1877/03/16 | CH |
| OTRIO | Antoine | M | Camisano (2 communes) | 1913/07/26 | I |
| OTRIO | Giuseppe | M | Grumolo delle Abbadesse (VI – Vénétie) | 1884/03/28 | I |
| OTT | Eugène | M | Bischofszell (Thurgovie) | 1863/04/17 | CH |
| OTT | François Antoine | M | Mommenheim (Bas-Rhin) | 1866/01/16 | D |
| OTT | Jean Christian | M | Zurich (canton de Zurich) | 1898/09/25 | CH |
| OTT | Jean Georges | M | Ornans (Doubs - France) | 1927/03/27 | CH |
| OTT | Louis Hugo | M | Bichofszell (Suisse) | 1864/05/23 | CH |
| OTT | Paul Théodore | M | Bischofszell (Suisse) | 1869/07/27 | CH |
| OTT | Philomène Véronique | F | Schweighausen | 1872/01/14 | Als |
| OTTER | Joseph Léon | M | Aedermannsdorf (Suisse) | 1880/02/10 | CH |
| OTTH | Jacob | M | Meiringen (canton de Berne) | 1883/04/13 | CH |
| OTTIE | Josephine | F | Hinzbach (Alsace) | 1880/08/10 | Als |
| OTTINO | Jean | M | Pralungo (BI - Piémont) | 1865/08/06 | I |
| OTTINO | Maximino | M | Pralungo (BI - Piemont) | 1886/11/28 | I |
| OTTMANN | Marie Catherine | F | Vendenheim (Basse Alsace ) | 1861/07/11 | Als |
| OTTOGALLI | Giovanni | M | Bianzè (VC - Piemont) | 01/01/1907 | I |
| OTTOLINI | Enrico | M | Chaux de Fonds (La) (canton de Neuchatel – Suisse) | 04/11/1900 | I |
| OTTONE | Francesco | M | Prato Sesia (NO - Piemont) | 1884/04/17 | I |
| OTTONI | Francesco | M | Prato Sesia (NO - Piemont) | 1879/06/29 | I |
| OTTONO | Yacinte | M | Correggio (RE – Emilie-Romagne) | 1907/08/08 | I |
| OUALE | Efreio | M | Uras (OR - Sardaigne) | 1874/06/06 | I |
| OUALI | Salem Ben Ali | M | Aït Atelli | 1888/00/00 | ALG |
| OUDORIZZI | Antoine | M | Bolone ? | 1866/08/15 | A |
| OUDOT | Yvonne Louise Léonie | F | Sombacour (Doubs – France) | 1900/05/21 | CH |
| OUISTIK | Joseph | M | La Haute Kravane | ? | PL |
| OULEVEY | Albert Louis | M | Vallorbe (canton de Vaud) | 1907/01/20 | CH |
| OULEVEY | Gilbert | M | Vallorbe (canton de Vaud - Suisse) | 04/03/1918 | CH |
| OUSSATOFF | Alexis | M | Ekaterinovar | 17/03/1900 | RUS |
| OUTKINE | Yvan | M | Novgorod Lanochina (Russie) | 1894/12/27 | RUS |
| OUZIEL | Albert | M | Salonique | 1895/07/15 | GR |
| OUZIEL | Isidore | M | Salonique | 1881/04/24 | GR |
| OUZIEL | Israël | M | Salonique | 1881/04/24 | TR |
| OVANZINI | Pietro | M | Curio (TI) | 1878/01/02 | CH |
| OVARD | Camille | M | Turin (TO - Piemont) | 1882/00/00 | I |
| OVENTILE | Giacomo | M | Salto Canavese ? | 1897/02/01 | I |
| OVERNAY | Elise Henriette | F | Saint Claude (Jura – France) | 28/05/1906 | CH |
| OVERNAY | François Marcellin | M | Crésuz (canton de Fribourg) | 1870/08/13 | CH |
| OVERNEY | André Joseph | M | Cerniat (canton de Fribourg) | 1879/09/11 | CH |
| OVERNEY | Ernest | M | Ornans (Doubs – France) | 1889/01/03 | CH |
| OVERNEY | François Xavier | M | Cerniat (canton de Fribourg) | 1870/08/15 | CH |
| OVERNEY | Hermann Joseph | M | Bulle (canton de Fribourg) | 20/08/1904 | CH |
| OVERNEY | Jacques Amédée | M | Cerniat (canton de Fribourg) | 1858/12/01 | CH |
| OVERNEY | Jean Napoléon | M | Cerniat (canton de Fribourg) | 1881/07/16 | CH |
| OVERNEY | Joséphine | F | Cerniat (canton de Fribourg) | 13/03/1904 | CH |
| OVERNEY | Louis | M | Cerniat (canton de Fribourg) | 1903/03/29 | CH |
| OVERNEY | Louis Adrien | M | Cerniat (canton de Fribourg) | 1905/03/22 | CH |
| OVERNEY | Louis Maurice | M | Boncourt (canton du Jura) | 1875/09/17 | CH |
| OVERNEY | Lucien Alexandre | M | Cerniat (canton de Fribourg) | 1860/04/03 | CH |
| OVERNEY | Marie Anne | F | Cerniat (canton de Fribourg) | 1902/01/23 | CH |
| OVERNEY | Marie Catherine | F | Charmey (canton de Fribourg) | 1899/05/11 | CH |
| OVERNEY | Pierre Emile | M | Cerniat (canton de Fribourg) | 1862/02/01 | CH |
| OVI | Gisberto | M | Castelnovo ne' Monti (RE – Emilie-Romagne) | 1872/12/08 | I |
| OVI | Giuseppe | M | Vetto (RE – Emilie-Romagne) | 1867/00/00 | I |
| OVIGLIO | Pierre Paul | M | Piacenza (PC – Emilie-Romagne) | 189206/05 | I |
| OVTCHINNIKOFF | Vladimir | M | Pliouskov | 1876/07/11 | RUS |
| OXNER | César Auguste | M | St Julien (Jura - France) | 1859/11/06 | CH |
| OXNER | Jean Etienne | M | Etoile (L') (Jura - France) | 1821/02/10 | CH |
| OZIO | Giovanni | M | Brembate (BG - Lombardie) | 1886/05/14 | I |
| OZZOLA | François | M | Brescia (BS - Lombardie) | 1892/03/30 | I |