| Orlaith ingen |
O'Braenain |
* 1090 Dublin, Ireland + 1115 Leinster (now in Ireland) |
- |
| Darbforgaill (ingen Donnchada) |
O'Brien |
* 1005 Leinster (now in Ireland) + 1090 Dublin, Ireland |
Munster - |
| Lafracoth of Munster |
O'Brien |
* 1076 Munster, Ireland + 1135 Abergwyngregyn, Gwynedd, Wales |
Ireland - Diarmit |
| Cacht ingen Loigsig (O'Moore) |
O'Morda |
* 1082 Leinster (now in Ireland) + 1149 Ireland |
- |
| Mary |
O'Neil |
* 1833 Ottawa, Ontario, Canada + 1918 Sawyer, Wisconsin, USA |
- |
| Mercertac (Mouitchertach) |
O'Toole |
* 1090 Meath, Ireland + 1164 Ireland |
- |
| More (Mor) |
O'Toole |
* 1114 Castledermot, Kildare, Leinster (now in Ireland) + 1191 Loch Garman, Wexford, Leinster (now in Ireland) |
O'Toole - O'Morda |
| Barack Hussein |
Obama |
* 1936 Nyangoma-Kogelo, Siaya District, Kenya + 1982 Nairobi, Nairobi Area, Kenya (Car Crash) |
- |
| Adelaide |
Oberto |
* 1883 Locana, Turin, Piedmont, Italy + 1920 Butte, Silver Bow, Montana, USA |
- |
| Astrid (Princess) of |
Obotrites |
* 979 Germany + 1034 Uppsala, Sweden |
- |
| Lieselotte Margarete |
Ocker |
* 1925 Stuttgart, Württemberg, Germany + 2012 Stuttgart, Baden-Württemberg, Germany |
- |
| Judith (Jutta) (von) |
Oehningen |
* 953 Öhningen (now in Konstanz, Baden-Württemberg, Germany) + 1032 |
- |
| Beatrice (de) |
Offaly |
* 1052 Offaly, Leinster, Ireland + 1100 England |
- |
| Julia M. |
Ogden |
* 1846 Bertrand, Berrien, Michigan, USA + 1921 Chippewa, Wisconsin, USA |
- |
| George |
Ogilvie |
* 1539 Dunlugas, Banffshire, Scotland + 1621 |
- |
| Janet |
Ogilvie |
* 1580 Dunlugas, Banffshire, Scotland + 1631 |
Ogilvie - Seton |
| Marjory |
Ogilvie |
* 1403 Scotland |
- |
| Dietrich (Count) of |
Oldenburg |
* 1398 Oldenburg (now in Lower Saxony), Germany + 1440 Delmenhorst (now in Lower Saxony), Germany |
- |
| Minerva Porterfield |
Olds |
* 1823 Jonesboro, Clayton, Georgia, USA + 1860 Hempstead, Arkansas, USA |
- |
| Anne |
Olmstead |
* 1566 Halstead, Essex, England + 1624 Halstead, Essex, England |
- |
| Minnie Leah |
Onkes |
* 1902 Elkhart, Elkhart, Indiana, USA + 1999 Millersburg, Elkhart, Indiana |
- |
| William II (Prince) of |
Orange |
* 1626 Netherlands + 1650 Amsterdam, Noord-Holland, Netherlands |
- |
| Anne Marie (Princess) of |
Orléans |
* 1669 Château de Saint-Cloud, Hauts-de-Seine, France + 1728 Turin, Savoy (now Piedmont), Italy |
Orléans - Great Britain |
| Elisabeth Charlotte of |
Orléans |
* 1676 Château de Saint-Cloud (near Paris), France + 1744 Commercy, Lorraine (now in France) |
Orléans - Rhine-Palatinate |
| Ermentrude of |
Orléans |
* 823 Orléans, West Francia (now in Loiret, Centre), France + 869 Paris, Île-de-France, France |
- |
| Louis I Valois (Duke) of |
Orléans |
* 1372 + 1407 Paris, Île-de-France, France |
France - Bourbon |
| Philippe I Bourbon (Duke) of |
Orléans |
* 1640 Château de Saint-Germain-en-Laye, France + 1701 Château de Saint-Cloud, Hauts-de-Seine, France |
- |
| Frowila |
Orseolo |
* 997 Venice, Italy + 1070 Austria |
- |
| Ita (von) |
Ortenau |
* 980 Ortenau, Swabia (now in Baden-Württemberg), Germany |
- |
| Adela of |
Orthen |
* 1045 France + 1086 Nivelles, Brabant (now Walloon Brabant, Belgium) |
- |
| Ellen |
Osbaldeston |
* 1480 Lancashire, England |
- |
| Nesta verch |
Osbern |
* 1079 Eardisley, Herefordshire, England + 1163 Brecon (Brecknock), Brecknockshire (later Powys), Wales |
FitzRichard - Gruffydd |
| Honor |
Osborn |
* 1645 Virginia, USA + 1701 Prince George's, Maryland, USA |
- |
| Alice |
Osborne |
* 1563 London, Middlesex, England + 1626 Isleham, Cambridgeshire, England |
- Hewett |
| Edward (Lord Mayor) |
Osborne |
* 1530 London, Middlesex, England + 1591 London, Middlesex, England |
Osborne - Broughton |
| Richard |
Osborne |
* 1510 Ashford, Kent, England + 1581 Ashford, Kent, England |
Osborne - Flydane |
| Richard |
Osborne |
* 1488 Ashford, Kent, England + 1573 Ashford, Kent, England |
- |
| Aefgifu (Irish Woman) of |
Ossory |
* 962 Osraige (Ossory) (now in Kilkenney), Ireland + 990 Glamis Castle, Glamis, Angus, Scotland |
- |
| Dirborgaill ingen Tadg of |
Ossory |
* 1008 Osraige (Ossory) (now in Kilkenney), Ireland + 1098 Glendalough, Wicklow, Leinster, Ireland |
- |
| Werner I (Prefekt) (der) |
Ostlandes |
* 785 Frankland (now in Germany) + 814 |
Nantharius - Dietberge |
| Oda of |
Ostmark |
* 1017 Meissen, Saxony (now in Germany) + 1068 Lausitz (now in Elbe-Elster, Brandenburg), Germany |
- |
| Theodoric "the Great" (King) of |
Ostrogoths |
* 454 Pannonia (now in Hungary) + 526 Ravenna, Italia, Roman Empire |
- |
| Amelia |
Ott |
* 1850 Union County, Pennsylvania, USA + 1917 Washington, Elkhart, Indiana, USA |
- |
| Edna L. |
Overbeck |
* 1902 Denver, Denver, Colorado, USA + 1925 |
- |
| Mary |
Overholtz |
* 1773 Bedford, Bedford, Pennsylvania, USA + 1852 Elkhart County, Indiana, USA |
- |
| Isabel |
Overton |
* 1608 Warwick, Warwickshire, England + 1660 Windsor, Hartford, Connecticut, USA |
- |
| Wilma Inez |
Overton |
* 1945 Double Springs, Winston, Alabama, USA + 2022 Elkhart, Elkhart, Indiana, USA |
- |
| Jimena Díaz (de) |
Oviedo |
* 1046 Spain + 1115 Burgos, Castile, Spain |
- |
| Anna Constable |
Owen |
* 1615 London, Middlesex, England + 1706 Dividing Creek, Northumberland, Virginia, USA |
- |
William Borneman
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