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| Letter "O" Individuals | 1-25 of 895 Individuals |
| Individual | Birth Date | Death Date | Sex |
 O'Bairrch, Moenach Snithe of Leinster MacMuiredach | | | M |
| O'Brien, Benjamin F. | 16 Apr 1839 | 11 Nov 1843 | M |
| O'Brien, Caroline | 3 Jul 1835 | Jul 1836 | F |
 O'Brien, George Henry | 10 Nov 1827 | 1 Mar 1889 | M |
| O'Brien, George W. | 13 Mar 1868 | 29 Oct 1940 | M |
 O'Brien, Henrietta | 18 Apr 1862 | 25 Jan 1930 | F |
| O'Brien, Henry C. | 6 Aug 1798 | 27 Jul 1858 | M |
| O'Brien, Henry, Earl of Thomond | | | M |
| O'Brien, John R. | 20 Dec 1833 | 4 Feb 1914 | M |
| O'Brien, Mary (Mollie) Eva | 19 Aug 1865 | | F |
| O'Brien, Mary C. | 19 May 1832 | | F |
| O'Brien, Mattie Jane | About 1883 | | F |
| O'Brien, Minnie Kate | 22 May 1871 | 18 Aug 1946 | F |
| O'Brien, Orville Lucien | About 1881 | | M |
| O'Brien, Robert D | 6 Apr 1825 | | M |
| O'Brien, Rosa Ella | 28 Mar 1857 | 14 Apr 1933 | F |
| O'Brien, Sammie May | 18 Sep 1875 | | F |
| O'Brien, Thomas | 23 Jul 1829 | | M |
| O'Brien, William Esquire | | | M |
| O'Brien, William P. | 6 Feb 1831 | 24 Mar 1860 | M |
| O'Brien, William, 2nd Earl of Inchiquin | | | M |
| O'Briens of Arcaill, The clan of | | | |
| O'Bryan, Mary E. | 1837 | | F |
| O'Byrne, Inghin | | | F |
| O'Canannan, The clan of | | | |
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Next 25 "O" Individuals >>
- Signifies that an individual has descendants.
- Signifies that an individual has SmartMatches.
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