- O'Kennedy
- O'Kerwick
- O'Kill
- O'Kinealy
- O'Lalor
- O'Laughlan
- O'Lavery
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Eugene d. 1733
- O'Lear
- O'Leary
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Arthur d. 4 May 1773Arthur VAlentine b. 15 Feb 1997Charlotte Catherine b. 1985Charlotte Jane b. 5 Feb 1963Daniel Hugh b. 1960Daphne Sylvia b. 18 Aug 1903Hans Nieber d. 1978Helen Fiona b. 1964Janet Douglas b. 29 Aug 1935, d. 27 May 1997John Terence b. 1960Katrina Elizabeth b. 30 Jun 1966Lettice b. 6 Nov 1994Margaret Mary b. 21 Jul 1868Mary Pryce Evelyn b. c 1838, d. 1890Maureen Olive d. 8 Jul 2015Norah Eugenie d. 1986Norrine Florence b. 1901, d. 1946Olive Mary b. 17 Mar 1900Pamela b. 1909, d. 1991Terence Daniel b. 18 Aug 1928, d. 11 Jul 2006Thomas Connor b. 1822, d. 1885William b. 1860
- O'Loan
- O'Loghlen
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1st Baronet, of Drumconora, Ennis, Co. Clare (Michael) b. 6 Oct 1789, d. 28 Sep 18422nd Baronet, of Drumconora, Ennis, Co. Clare (Colman Michael) b. 20 Sep 1819, d. 22 Jul 18773rd Baronet, of Drumconora, Ennis, Co. Clare (Bryan) b. 27 Jun 1828, d. 31 Oct 19054th Baronet, of Drumconora, Ennis, Co. Clare (Michael) b. 16 Oct 1866, d. 23 Mar 19345th Baronet, of Drumconora, Ennis, Co. Clare (Charles Hugh Ross) b. 6 Jul 1881, d. 23 Jul 19516th Baronet, of Drumconora, Ennis, Co. Clare (Colman Michael) b. 6 Apr 1916, d. 6 Mar 20147th Baronet, of Drumconora, Ennis, Co. Clare (Michael) b. 21 May 1945Aimee Margaret Julia b. 26 May 1891, d. 28 Jul 1954Annie Bidelia Margaret b. 28 Dec 1864, d. 6 Aug 1952Barbara d. 1820Beatrice Mary d. 5 Feb 1953Brendan b. 18 Sep 1959Bryan b. 30 Aug 1946Bryan James b. 20 Jan 1875, d. 26 Jun 1920Bryan, 3rd Bt. b. 27 Jun 1828, d. 31 Oct 1905Charles Hugh Ross, 5th Bt. b. 6 Jul 1881, d. 23 Jul 1951Clare Mary b. 10 Feb 1889, d. 25 Sep 1968Colman d. 1826Colman b. 1745, d. May 1810Colman b. 21 Nov 1955Colman Michael, 2nd Bt. b. 20 Sep 1819, d. 22 Jul 1877Colman Michael, 6th Bt. b. 6 Apr 1916, d. 6 Mar 2014Colman Seward b. 16 Dec 1869, d. 29 Oct 1909David b. 10 Aug 1972Ella d. 6 Jun 1919Ella Maude b. 7 May 1874, d. 5 Nov 1960Frances Mary b. 20 Apr 1876, d. 23 Jul 1972Henry Ross b. 29 Nov 1886, d. 22 Jul 1944Hugh b. 1 Oct 1784, d. 9 May 1849Hugh b. 29 May 1952Hugh b. 6 Dec 1968Hugh Ross b. 10 May 1827, d. 19 Nov 1850Hugh Ross b. 18 Feb 1872, d. 21 Sep 1872Janet b. 1942Lucy Susan Mary b. 11 Jul 1868, d. 30 Jul 1942Margaret d. Apr 2010Margaret b. 1940Michael b. 27 Nov 1829, d. Apr 1896Michael, 1st Bt. b. 6 Oct 1789, d. 28 Sep 1842Michael, 4th Bt. b. 16 Oct 1866, d. 23 Mar 1934Michael, 7th Bt. b. 21 May 1945Rory b. 7 Jul 1975Ross b. 26 Apr 1948Ross Bryan b. 15 Mar 1914, d. 14 Jan 1944Susan b. c 1820, d. 3 Nov 1880Susan Ann b. 24 Aug 1943Susannah d. 1822Violet Elizabeth Amelia d. 1951
- O'Loughlen
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Henrietta d. 17 Nov 1797Margaret b. c 1535
- O'Loughlin
- O'Madden
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Mary b. c 1703, d. 2 Dec 1740
- O'Mahomey
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Deirdre Lillian Mary b. 5 Jan 1958Hugh Frederick Michael b. 17 Aug 1948Kevin Edmund b. 9 Jun 1943, d. 1983Madeline b. 29 Mar 1917Philippa Katherine b. 20 Dec 1944Stephen Lawrence Thomas b. 24 Dec 1956
- O'Mahoney
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Pamela Evelyn b. 1916
- O'Mahony
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'Le fameux Mahoni' d. Jan 1714Adelaide Beaujolais Stuart d. 1920Alice Jane d. 29 Jun 1906Annabel Florence Eleanor b. 5 Feb 2012Callum Paul Joseph b. 1993Catherine Holly Amber b. 1990Cecilia d. c 1708Daniel, Comte de Castile d. Jan 1714Demetrius d. 1776Hannah Charlotte b. 4 Jul 1956Jane b. 4 Oct 1883, d. Jan 1950Jessica Nollaig Caroline b. 5 Apr 2016Lucy Caroline Eleanor b. 1981Mary Anne b. 18 Nov 1701, d. 1751Sebastian Charles Donal b. 3 Feb 2014
- O'Mahundre
- O'Malley
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Barrett Lennard Albermarle b. 29 Sep 1877, d. 1976Blanche Alice b. 16 Feb 1833, d. Jul 1869Brendan b. 10 Feb 1952Bryan b. 1837, d. 12 Jan 1909Bryan Francis Keppel b. 2 Feb 1873, d. 1957Charles Patrick b. 16 Oct 1947Clementine Blanche b. May 1863Conor b. 8 Apr 1966Derek Keppel Coleridge b. 7 Nov 1910, d. 4 Sep 1940Dermot Raymond b. 18 Dec 1951Frances b. c 1845, d. 10 Nov 1931Gladys Aileen d. 10 Nov 1957Grace Elizabeth Amelia Henrietta b. b 28 May 1876, d. 1951Grania Mary b. 31 Jul 1950Hamilton Joseph Keyes b. 19 Oct 1910Henry b. 1818, d. 1867Ida Sewell b. 16 Aug 1873Iris Victoria Beatrice Grace b. 13 Jan 1920, d. 1 Sep 1982Lewis Sydney Steward b. 23 Oct 1874, d. 1941Lorna Josephine b. c 1885, d. 1959Madeleine b. 22 Mar 2000Middleton Joseph b. 31 Dec 1882, d. 18 Feb 1933Oliva b. 16 Dec 1993Patrick Peter b. 17 Mar 1949Paul Joseph b. 1965Pearce Patrick b. 17 May 2007Peter Douglas b. 1992Rachel Mary Genevieve b. 3 Jan 1914Sean Patrick b. 1966Timothy Paul b. 1994unknown son b. 21 Jun 1959William b. 1830