- O'Malley-Keys
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Middleton Joseph b. 31 Dec 1882, d. 18 Feb 1933Middleton Joseph b. 31 Dec 1882, d. 18 Feb 1933
- O'Malloy
- O'Malone
- O'Mara
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Kate b. 10 Aug 1939
- O'Mclaghlin
- O'Meagher
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Joanna d. 1801
- O'Meara
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Barry Edward d. 3 Jun 1836Charlotte Theresa d. 21 Aug 1913Emily Jane b. 22 Mar 1882, d. 28 Dec 1954Eugene John d. 25 Jun 1962Hannah b. 23 Jan 1897, d. 18 Nov 1998Joseph b. 1962Sophie Ann Cotton b. 1992Theodosia Anna Maria d. 14 Jan 1830William Michael b. 17 Apr 1926, d. 24 Jan 2014
- O'Melaghlin
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Tailltin d. 1128
- O'Mera
- O'Molloy
- O'Moore
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Annie Sarah b. c 1838Annie Sophia b. c 1818, d. 27 Mar 1908Mary d. 1871
- O'Moran
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Georgiana Catherine Theresa d. 2 Aug 1853Mabel b. c 1882
- O'Morchoe
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Arthur Donel MacMurrogh, The O'Morchoe b. 3 Jun 1892, d. 29 Aug 1966Brendan Michael Creagh b. 25 Jun 1989Caitlin Rebecca Creagh b. 20 Oct 1990Charles Christopher Creagh b. 7 May 1931, d. 18 Apr 2011Charles Eric Creagh b. 14 Apr 1957Christian Margaret b. 8 Sep 1957Christopher Liam Creagh b. 26 Oct 1992Claire b. 13 Sep 1970Daniel David Joseph b. 25 May 1987David James Creagh b. 14 Apr 1961David Nial Creagh, The O'Morchoe b. 17 May 1928Deirdre Kathleen b. 15 Apr 1960, d. 17 Sep 1960Dermot Arthur b. 11 Aug 1956Dorothy b. 14 Apr 1897, d. 3 Jan 1980Edward Maurice b. 9 Aug 1956Elizabeth Anne b. 10 Jan 1931Eva Augusta Elizabeth d. 12 Apr 1974Frances Eileen b. 17 Oct 1989Frances Mary b. 7 Apr 1944, d. 25 Mar 2002Honor Gertrude b. 6 Feb 1899, d. 9 Jul 1973Isabel Hester Louise b. 5 May 1899, d. 12 Apr 1947Katherine Elizabeth Creagh b. 16 Mar 1986Kathleen b. 26 Jan 1902, d. 9 Aug 1995Kenneth Gibbon b. 16 Feb 1894, d. 22 Dec 1962Kevin Nial b. 17 Apr 1958Maureen Dorothy b. 6 Jan 1964Maurice Gethin b. 11 Jan 1901, d. 6 Feb 1959Michael b. 17 Dec 1973Nial Creagh, The O'Morchoe b. 26 Sep 1895, d. 26 Feb 1970Patricia Christian b. 16 Jul 1991Patricia Jean d. 5 Jul 2003Philip Kenneth b. 6 Oct 1988Sally Margaret b. 13 Aug 1990Thomas Arthur Bagenal b. 20 Sep 1941Thomas Arthur MacMurrough Murphy b. 22 Mar 1865, d. 18 Nov 1921Thomas Arthur MacMurrough Murphy, The O'Morchoe b. 22 Mar 1865, d. 18 Nov 1921Wendy Doreen b. 22 Jan 1991William Niall b. 20 Jan 1993
- O'More
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Charles d. 12 Jul 1691
- O'Mores
- O'Mullane
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Catherine b. 1752, d. Feb 1817
- O'Mulloy
- O'Mulrian
- O'Mulroony
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Durcloulagh d. 1169
- O'Mulryan
- O'Mulvihill
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Charles d. 1847Daniel d. 1820
- O'Murphy
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Marie Louise b. 1737, d. 1815
- O'Neal
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Charles b. 6 Jan 1904, d. 29 Aug 1996Edith Marion Lysaght b. 29 Jan 1889, d. 1985Griffin b. 1964Leigh b. 25 Jan 1945Patrick b. 14 Sep 1967Redmond b. 1985Ryan b. 20 Apr 1941Tatum b. 5 Feb 1963
- O'Neale
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Alison Margaret b. 1949Catherine b. 1609, d. 9 Apr 1667Daniel d. 24 Oct 1664Martha b. c 1707, d. 11 Mar 1796
- O'Neil
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Arthur b. b 1570, d. a 20 Oct 1597Bridget b. 1825, d. 1896Elizabeth d. 13 Oct 1930Emma b. 10 Jan 1994Jessica b. 18 Aug 2000Joy Agnes b. 18 Mar 1947Julia Eva b. 28 Oct 1877, d. c Jan 1974Lindsay Frances Louis b. 1968Peter Sean b. 1973Renée Rose b. 1975Shaion b. c 1998Susan Mary b. 21 Aug 1963Turlough Lynach d. 9 Sep 1596Valerie Evelyn b. 8 Mar 1950
- O'Neil-Roe
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Isabella Grace b. 1914, d. 6 Mar 2011Nancy Letitia Whitaker b. 1914, d. 18 Jan 2011Richard John Owen b. 3 Jun 1918, d. 26 Jun 1942Robert Gordon Brabazon b. 15 Dec 1911, d. 30 Oct 1997
- O'Neill Flanagan
- O'Neill of Bengarve
- O'Neill of Clackmannan
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Baron, of Clackmannan in Clackmannanshire (Martin John) b. 6 Jan 1945, d. 26 Aug 2020
- O'Neill of Gatley
- O'Neill of Shane's Castle
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1st Baron, co. Antrim (John) b. 16 Jan 1740, d. 17 Jun 17981st Baron, co. Antrim (William) b. 4 Mar 1813, d. 18 Apr 18832nd Baron, co. Antrim (Charles Henry St. John) b. 22 Jan 1779, d. 25 Mar 18412nd Baron, co. Antrim (Edward) b. 31 Dec 1839, d. 19 Nov 19283rd Baron, co. Antrim (John Bruce Richard) b. 30 Dec 1780, d. 12 Feb 18553rd Baron, co. Antrim (Shane Edward Robert) b. 6 Feb 1907, d. 24 Oct 19444th Baron, co. Antrim (Raymond Arthur Clanaboy) b. 1 Sep 1933Baroness (Anne Geraldine Mary) b. 19 Jun 1913, d. c Jul 1981Baroness (Elizabeth Grace) d. 22 Jan 1905Baroness (Georgina Mary) b. 28 Nov 1940, d. 29 Aug 2017Baroness (Louisa Katherine Emma) d. 10 Aug 1942
- O'Neill of the Maine
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Baron, of Ahoghill in the County of Antrim (Terence Marne) b. 10 Sep 1914, d. 12 Jun 1990
- O'Neill
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'Toridelbach Luineach' d. 1595'Ua Neill Mor' d. 14031st Baronet (Robert William Hugh) b. 8 Jun 1883, d. 28 Nov 19821st Baronet, of Killeagh, co. Antrim (Henry) b. 1625, d. 27 Nov 16711st Earl (Charles Henry St. John) b. 22 Jan 1779, d. 25 Mar 18411st Viscount (John) b. 16 Jan 1740, d. 17 Jun 17982nd Baronet (Phelim Robert Hugh) b. 2 Nov 1909, d. 20 Dec 19942nd Baronet, of Killeagh, co. Antrim (Niall) b. c 1658, d. 8 Jul 16902nd Viscount (Charles Henry St. John) b. 22 Jan 1779, d. 25 Mar 18413rd Baronet (Hugh Detmar Torrens) b. 14 Jun 19393rd Viscount (John Bruce Richard) b. 30 Dec 1780, d. 12 Feb 1855Ada Louise b. 23 Dec 2007Aedh d. 1475Aedh d. 1555Aedh d. 1583Aedh 'Buidhe' d. 2 May 1444Aedh 'Buie' d. 6 Oct 1524Aedh 'Buie' d. bt 1616 - 1619Aedh 'Dubh' d. b 1667Aedh 'Géimhleach' d. 1590Aedh 'Géimhleach' d. 1590Aedh 'Og' d. 20 Mar 1616/17