- 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 1946
- 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. 1749Cornelius d. a 1469Cornelius d. c 1670Cornelius d. 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 1797
Cornelius, 1st Viscount Lismore b. 2 Oct 1775, d. 30 May 1857
Daniel 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. 1824Esteban b. 1936Frances d. Aug 1879Frances b. 18 Feb 1757, d. 25 Mar 1827