- O Cuív
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Emer b. 15 Aug 1918, d. 9 Feb 2012
- O'Ahern
- O'Bannon
- O'Beirne
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Brigid Margaret b. 19 May 1954Caroline b. 21 Feb 1805, d. 10 Jan 1878Catherine Mary b. 16 Aug 1960Cecil Hugh b. 19 May 1931Derek Francis b. 4 Feb 1952Helen Denise b. 23 Nov 1969Henrietta d. 31 Jan 1731Hubert V. d. 30 May 1959Isabel Mary b. 14 Oct 1895Jane d. 10 Mar 1905Joseph Francis b. 12 Dec 1923Margaret Ellen b. 22 Jun 1925Maria Theresa d. 13 Feb 1777Roderick William b. 17 Feb 1953
- O'Boyle
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Dorothy Charlotte b. 10 Jul 1950Edward d. 31 Jan 1865Eliza d. 24 Feb 1888James b. a 1848Marlon Orion Sandford b. 1982Patrick Robert b. 23 Jul 1780, d. 8 Nov 1827
- O'Bready
- O'Brian
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Clare Josephine b. 12 Jun 1903, d. 17 Feb 1998Eileen Vivien de la Poer b. 17 Aug 1912, d. 10 May 1975Maureen b. 19 Jan 1932, d. 23 Dec 2013Michael b. 23 Nov 1937, d. 26 Sep 1968Patrick b. 12 Dec 1914, d. 4 Jan 2000Patrick b. 12 Dec 1914, d. 4 Jan 2000Shelagh b. 5 Aug 1934
- O'Brian-McSwiney
- O'Brien Butler
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Aurelia Rebecca d. 31 Mar 1861Capel Desmond b. 1889, d. 7 Jun 1917Catherine d. 1834Catherine b. c 1730, d. 1807Catherine Grace b. 21 Jul 1901Charles Paget b. 18 Jul 1881, d. 1 Nov 1914Edmond d. 26 Mar 1837Edmund d. 1806Edmund b. c 1806, d. 15 Jun 1877Elizabeth d. 1817Elizabeth b. c 1775, d. 1850Frances d. 31 Dec 1851Georgina d. 19 Oct 1835Grace d. 1886Henry d. Nov 1857Ida Mary b. 8 May 1897, d. 30 Aug 1937James Eustace b. c 1883, d. 31 Jul 1887Jane d. 18 May 1865John d. Jan 1833John d. b 1834Mary d. b 1839Mary Anne d. 1790Mary Anne d. 8 Nov 1848Mary Anne d. b 1834Mary Millicent b. 1876Millicent Aurelia b. 3 Mar 1899, d. 26 Oct 1984Morgan b. c 1772, d. 10 Jan 1839Murrough d. b 1834Murrough b. c 1772, d. 10 Jan 1839Paget b. 18 Jul 1881, d. 1 Nov 1914Paget Terence b. 1 Aug 1911, d. 22 Jun 1952Pierce b. c 1772, d. 1812Pierce b. 3 Oct 1803, d. 22 Jul 1878Pierce b. c 1839, d. 3 Apr 1912Pierce b. 1912Pierce Edmond b. 12 Jan 1877, d. 15 Jan 1902Pierce Essex b. 15 Nov 1858, d. 2 Nov 1954Pierce John b. c 1831, d. 6 Apr 1832Terence b. 1 Aug 1911, d. 22 Jun 1952Turlough b. 12 Apr 1834, d. 15 Aug 1834William d. 1773William d. 1773William d. 22 May 1869William d. b 1834William b. 1843, d. 12 Oct 1855William Dunboyne b. c 1878, d. 11 Jan 1884
- O'Brien of Burren
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1st Baron, co. Clare (Morrogh) b. Oct 1614, d. 9 Sep 16742nd Baron, co. Clare (William) b. c 1640, d. Jan 1691/923rd Baron, co. Clare (William) b. c 1666, d. 24 Dec 17194th Baron, co. Clare (William) d. 18 Jul 17775th Baron, co. Clare (Murrough) b. 1726, d. 10 Feb 18086th Baron, co. Clare (William) b. c 1765, d. 21 Aug 18467th Baron, co. Clare (James) b. c 1768, d. 3 Jul 1855
- O'Brien of Lothbury
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Baron, of the City of London (Leslie Kenneth) b. 8 Feb 1908, d. 24 Nov 1995
- O'Brien
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'An tothaine' b. Oct 1614, d. 9 Sep 1674'The Fat' d. 1 Apr 1553'The Great Earl' d. 5 Sep 162410th Baronet, of Lemeneagh and Dromoland, co. Clare (Conor Myles John) b. 17 Jul 1943, d. 3 Jun 20231st Baron, of Kilfenora, co. Clare (Peter) b. 29 Jun 1842, d. 7 Sep 19141st Baronet (Ignatius John) b. 31 Jul 1857, d. 10 Sep 19301st Baronet (Peter) b. 29 Jun 1842, d. 7 Sep 19141st Baronet, of Lemeneagh and Dromoland, co. Clare (Donough) b. 1642, d. 17 Nov 17171st Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (Timothy) b. 1787, d. 3 Dec 18622nd Baronet, of Lemeneagh and Dromoland, co. Clare (Edward) b. 7 Apr 1705, d. 26 Nov 17652nd Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (Patrick) b. 1823, d. 25 Apr 18952nd Count (Antonio) d. 27 Jan 19683rd Baronet, of Lemeneagh and Dromoland, co. Clare (Lucius) b. 2 Sep 1731, d. 15 Jan 17953rd Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (Timothy Carew) b. 5 Nov 1861, d. 9 Dec 19484th Baronet, of Lemeneagh and Dromoland, co. Clare (Edward) b. 17 Apr 1773, d. 13 Mar 18374th Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (Robert Rollo Gillespie) b. 9 Jun 1901, d. 18 Apr 19525th Baronet, of Lemeneagh and Dromoland, co. Clare (Lucius) b. 5 Dec 1800, d. 22 Mar 18725th Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (John Edward Noel) b. 23 Dec 1899, d. 28 Sep 19696th Baronet, of Lemeneagh and Dromoland, co. Clare (Edward Donough) b. 14 May 1839, d. 9 Apr 19006th Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (David Edmond) b. 19 Feb 1902, d. 19827th Baronet, of Lemeneagh and Dromoland, co. Clare (Lucius William) b. 21 Jun 1864, d. 9 Dec 19297th Baronet, of Merrion Square, Dublin and Borris-in-Ossory, Queen's County (Timothy John) b. 6 Jul 19588th Baronet, of Lemeneagh and Dromoland, co. Clare (Donough Edward Foster) b. 5 Jan 1897, d. 19 Oct 19689th Baronet, of Lemeneagh and Dromoland, co. Clare (Phaedrig Lucius Ambrose) b. 4 Apr 1900, d. 20 May 1982Agnes Purdom d. 1970Aileen b. 4 Jan 1913Ailne Mary d. 1945Aine d. 1591Aine b. 1578, d. 2 Sep 1606Alexander Kennedy b. 30 Mar 1955Alice Louise b. 1986Alice Miranda b. 6 Nov 2005Alicia Amabel b. 12 Jul 1860, d. 28 Jul 1939Amy b. 1578, d. 2 Sep 1606Anastasia Kathleen Lucia b. 20 Jan 1856, d. 1 Apr 1938Angelina Mary d. 29 Apr 1836Angelina Rose Geraldine d. 18 Aug 1941Ann b. 17 Sep 1796, d. 31 Jul 1877Annabella Charlotte d. 20 Feb 1907Annalette Leonora Stella b. 8 Mar 1999Anne d. 7 Dec 1756Anne d. c 13 Sep 1644Anne d. 20 Jul 1872Anne b. 12 Mar 1591/92, d. c Apr 1675Anne b. 1720, d. 19 Jan 1745Anne b. c 1721, d. 1808Anne b. 10 Nov 1788, d. 22 Oct 1874Anne Maria d. 24 Dec 1846Anne Molyneux b. 17 Dec 1898, d. 10 Aug 1973Annie d. 7 Sep 1914Annie d. 1 Feb 1929Annie Winifred d. 10 May 1936Anthony Derek b. 2 May 1947Antonia d. 1805Auberie Anne Penelope d. 2 Dec 1703Aubrey John b. 5 Dec 1870, d. 31 Aug 1930Aubrey Stephen b. 4 May 1837, d. 18 Dec 1898Aubrey Ulick Marshall b. 7 Jun 1882, d. 1 Nov 1914Aubrey William Vere b. 29 Nov 1885, d. 7 Oct 1925Audrey Mary b. 21 Aug 1935, d. 30 Sep 2018Audrey Mary Elizabeth d. 25 Sep 1925Audrey Townsend d. Jan 1957Augusta Louisa Jane d. 15 Jan 1861Barnabas, 5th Earl of Thomond b. c 1590, d. c 12 Nov 1657Baroness (Annie) d. 7 Sep 1914Bartholomew Brendan b. 22 Oct 1953Beatrice b. 23 Dec 1882, d. 10 Oct 1976Beatrice Mary d. 1960Blanche Louisa b. 12 Jul 1860, d. 19 Jan 1945Brendan Edward b. 11 Jan 1903, d. 1984Brian b. 12 Jul 1872, d. 29 Oct 1915Brian b. Mar 1908, d. Nov 1968Brian David b. 1 Nov 1963Brian Dermod b. 14 Jan 1942Brian Douglas Conor b. 29 Sep 1997Brian Edward Nicholas b. 17 Aug 1951Brian Eoghan b. 1907, d. 3 Aug 1940Brian Murrough Fergus b. 18 Jul 1931Bridget M. d. 4 May 1941Caroline Cecilia b. 1985Caroline Louisa Maire b. 1992Caroline Phyllis Anne b. 25 Oct 1942