- O'Brien-ffrench
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Alexis Evelyn Henry b. 11 Oct 1896, d. 8 Aug 1956Christina Laetitia b. 9 Jul 1935Conrad Fulke Thomond, 2nd Marquess of Castel Thomond b. 19 Nov 1893, d. 23 Oct 1986Henry Albert de Vreque, 1st Marquess of Castel Thomond b. 7 Mar 1862, d. 10 Nov 1933Jacqueline Frances Mary b. 28 Jul 1919John Valentine b. 14 Jun 1951Rollo Acheson b. 27 Nov 1948Rollo Adrien Vladimir Thursby Marie Altieri b. 30 Jul 1892, d. 18 Nov 1909Winifred b. 11 Nov 1868, d. 4 Aug 1913Winifred Gisela Yvonne Castelthomond b. 26 Sep 1901Yvonne b. 26 Sep 1901
- O'Brolchain
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Blathnaid b. 26 May 1918
- O'Bryen
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Gerald Francis d. b 1950Jane d. bt May 1769 - Jun 1769Mary Isabel d. 21 Dec 1946Mary Isabella b. 2 May 1840, d. 18 Feb 1867
- O'Bryne
- O'Burne
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Patricia Kathleen b. 1906Raymond Vincent d. 1973
- O'Byrne
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Edward Alexander d. 13 Aug 1920Feaght Mac Hugh d. 1597Mary d. 6 Feb 1957Phelim d. 1630unknown daughter d. 1542
- O'Cahan
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James b. 1787, d. 26 Dec 1871Joseph d. 1756Margaret b. c 1662, d. 29 Apr 1721
- O'Cahill
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Edmond d. bt 13 Apr 1752 - 4 Jan 1753
- O'Callaghan
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Adelaide d. 11 May 1910Agustin b. 1851, d. 1890Amado C. b. 1870, d. 1873Angel b. 1925Anne Maria Louisa d. 6 Jul 1867Antonia b. 1912Cahir d. fr 27 Feb 1678/79 - 19 Dec 1679Cahir d. a 1638Cahir d. b 1680Callaghan d. 1115Callaghan d. a 1679Callaghan d. b 1679Callaghan d. 1578Callaghan d. a 1579Callaghan d. a 1666Callaghan, The O'Callaghan b. c 1580, d. 31 May 1631Carlos d. 1921Carlos b. 1730, d. 1774Carlos b. 1791, d. 1794Carlos b. 1812, d. 1836Carlos b. 1847Carlos b. 1890, d. 1891Carlos b. 1942Catherine d. Oct 1854Catherine d. 24 May 1898Catherine d. 1731Catherine b. 1784, d. 1869Charles George Martin b. 1821, d. 29 Oct 1895Concepción b. 1914Connogher d. c 1670Connoghor d. b 1577Connoghor 'Garriff' d. b 1577Connoghor MacDermot d. b May 1612Connor d. fr 3 Apr 1637 - 14 Nov 1638Connor of the Rock d. b May 1612Connor, The O'Callaghan d. a 1469Cornelius d. 1761Cornelius d. 1749Cornelius d. a 1469Cornelius d. c 1670Cornelius d. 29 Nov 1793Cornelius d. Oct 1829Cornelius b. 1693, d. 1741Cornelius b. 27 Sep 1786, d. 29 Apr 1824Cornelius b. 1809, d. 16 Aug 1849Cornelius b. 15 Jan 1835, d. 12 Apr 1836Cornelius b. 12 Oct 1836, d. 10 Dec 1895Cornelius, 1st Baron Lismore of Shanbally b. 7 Jan 1740/41, d. 12 Jul 1797Cornelius, 1st Viscount Lismore b. 2 Oct 1775, d. 30 May 1857Daniel b. c 1750, d. c Oct 1772Daniel, The O'Callaghan d. 1724Dermot d. a 1679Dermot 'Roe' d. 13 Feb 1636Dionisio b. 1732Dolores b. 1849, d. 1851Dolores b. 1869Dolores b. 1924Dolores Isabel b. 1917, d. 26 Sep 1968Donagh d. a 1679Donagh d. a 1638Donat b. 15 Jul 1789, d. c 1790Donatus b. 5 Aug 1841Donnell d. a 1601Donogh d. 1577Donogh d. 1708Donogh d. c Apr 1767Donogh b. a 1563, d. 1584Donogh 'Og' d. c 1698Edmond d. c 8 Sep 1791Edward d. 1841Eileen Lorna d. 1989Eleanor d. 1859Elena b. c 1618Elena b. 1738, d. 1775Elena b. 10 Feb 1962Elizabeth d. 1824