Honora O'Brien (____ - UNKNOWN)
Mor O'Brien (____ - UNKNOWN)
Teige O'Brien (____ - 1578)
Gormlaith Ingen Finn O'caellaide (____ - ____)
Agnes O'cathan (1270 - ____)
Helen O'connor (____ - ABT 1978)
Mary M. O'dell (17 Nov 1902 - 6 Aug 1986)
Jack O'Keefe (____ - ____)
Cacht Ingen Loigsig O'morda (____ - ____)
Loigsech O'morda King Of Loigsi (King Of Loigsi) (____ - 1149)
John O'neal (____ - ____)
Augaire Mac Dunlaing O'toole (ABT 0950 - 1014-1024)
Gillachomhghalli O'toole (0980 - 1041)
Moringen Muirchertaig O'toole (____ - ____)
Mouirchertach, O'toole (____ - 1164)
Margery Oakley (ABT 1288 - ____)
Margery de Oakley (ABT 1267 - ____)
Mary Oakley (ABT 1671 - ____)
Barack Hussein Obama (ABT 18 Jun 1934 - 24 Nov 1982)
Onyango Obama (ABT 1895 - ABT 1979)
Elizabeth B. Oberholtzer (____ - ____)
Elsbeth Oberholtzer (ABT 1590 - ABT 1650)
Samuel Oberholtzer (____ - ____)
Elizabeth Ocher (____ - ____)
Ann Ocker (3 Apr 1800 - 10 Jun 1809)
Eachraidh Ui Aeda Odba (ABT 0950 - ABT 0980)
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