- O'Carroll
- O'Carroll (Barbatus)
- O'Connell
- O'Conner
- O'Connor
- O'Connor-Morris
- O'Conor
- O'Dea
- O'Donaghue
- O'Donel
- O'Donnell
- O'Donoghue
- O'Donohue
- O'Donovan
- Anne Becher (b. abt 1776, d. Jun 1839)
- Eleanor (b. 1808, d. 6 Jun 1876)
- Henry Becher (b. abt 1774, d. 1799)
- Henry Winthrop (b. 1 Jan 1812, d. 24 May 1890)
- Honoria
- Mary Towgood (b. abt 1775, d. Dec 1841)
- Melian Towgood (b. abt 1770, d. 1813)
- Melian Towgood (b. abt 1814, d. 28 Apr 1858)
- Morgan (b. abt 1740, d. Sep 1802)
- Morgan (b. 1769, d. 17 Oct 1839)
- Morgan William (b. 21 Aug 1796, d. 16 Dec 1870)
- Philip (b. abt 1772, d. Dec 1837)
- Sampson Towgood (b. abt 1773, d. 1809)
- Savage (b. abt 1771, d. 1807)
- William Jones (b. Jan 1799)
- O'Dowda
- O'Dwyer
- O'Fallon
- O'Farrall
- O'Farrell
- O'Ferrall
- O'Flahertie
- O'Garvey
- O'Gorman
- O'Grady
- ? (d. bef 1881)
- Amelia (b. 1 Jan 1823, d. 26 May 1896)
- Annabel
- Berkeley Standish (b. 24 Oct 1845, d. 23 Aug 1858)
- Cecilia (b. 25 Jun 1855, d. 17 Sep 1919)
- Dora
- Frederick Stanley (b. 20 Apr 1847)
- Gertrude
- Hardress Standish (b. 20 Oct 1841, d. 6 Feb 1918)
- John Walter de Courcy (d. 2 Nov 1914)
- Katherine Grace (b. 1828, d. 8 Jun 1879)
- Kathleen Eleanor Herietta
- Maria
- Paget Standish (b. 29 Nov 1835, d. 29 Jul 1877)
- Reginald Grimston Standish (b. 9 Mar 1839, d. 25 Dec 1874)
- Sophia (d. 4 Nov 1912)
- Standish (b. 8 Jul 1832, d. 10 Apr 1860)
- Standish (b. 25 Jul 1854, d. 17 Jan 1856)
- Standish Derby (b. 26 Dec 1795, d. 22 Jul 1848)
- Thomas
- O’Grady
- O'Hagan
- Anne Katherine
- Caroline
- Charles (b. 1838, d. 1840)
- Edward
- Elizabeth Mary, (Hon) (b. 23 Nov 1880, d. 23 Dec 1880)
- Frances Mary (d. 1910)
- John, (Hon) (d. Nov 1890)
- Kathleen Mary, (Hon) (b. 13 May 1876, d. 1974)
- Madeline (d. 14 Oct 1875)
- Mary Caroline, (Hon) (b. 25 Nov 1879, d. 1972)
- Mary Helen
- Maurice Herbert Towneley (b. 20 Feb 1882, d. 1961)
- Thomas (b. 29 May 1812, d. 1 Feb 1885)
- Thomas Towneley, (Lt-Gen) (b. 5 Dec 1878, d. 13 Dec 1900)
- O'Hagen
- O'Halloran
- Ann Helen (b. 1795, d. 1856)
- Charles Sylvester (b. 1791, d. 1812)
- Dorothy Faith (b. 24 Oct 1902, d. 24 Feb 1984)
- Edward Paget (b. 1802, d. 1831)
- Faith
- Frances Bayly (b. 1793)
- Frances Bayly (b. 1807)
- Frances Franklin (b. 1812)
- Frances Jane (b. 1839)
- Frederick George, (Rev) (b. 10 Mar 1872, d. 6 Jun 1959)
- George Waring (b. 1836, d. 1903)
- Henry Dunkin (b. 1840, d. 1916)
- Henry Dunn (b. 1800, d. 1871)
- Jane Baillie (b. 1808, d. 1887)
- John Nicholas (b. 1810, d. 1886)
- Joseph, (Maj-Gen Sir) (b. 13 Aug 1763, d. 3 Nov 1842)
- Joseph Palmer (b. 1807, d. 1825)
- Maria Nugent (b. 1814, d. 1884)
- Sophia Sherbourne (b. 1803, d. 1832)
- St George (b. 1799, d. 1815)
- Thomas Joseph Shuldham (b. 27 Apr 1835, d. 9 Jan 1922)
- Thomas Shuldham (b. 1797, d. 1870)
- William Littlejohn (b. 1806, d. 1885)
- O'Hanlon
- O'Hara
- O'Hare
- O'Hea
- O'Hear
- O'Kane
- O'Keary
- O'Keefe
- O'Keeffe
- O'Kelly
- O'Kelly de Gallagh
- O'Leary
- O'Mahoney
- O'Malley
- O'Meara
- O'Morda
- O'Morra
- O'Neal
- O'Neale
- O'Neil
- O'Neile
- O'Neill
- Alice, (Lady) (b. abt 1583, d. aft 19 Aug 1633)
- Alice Esmeralda
- Alice Esmeralda
- Annie
- Arthur Edward Bruce (b. 19 Sep 1876, d. 6 Nov 1914)
- Brian Arthur (b. 31 Mar 1911, d. 15 May 1940)
- Brian W P
- Catherine
- Charles
- Charles Henry StJohn (b. 22 Jan 1779)
- Con Bachach, (Earl) (b. abt 1484, d. aft 1558)
- Con Mor, (King) (d. 8 Jan 1493)
- Edward (b. 31 Dec 1839, d. 19 Nov 1928)
- Elinor Mary
- Elizabeth (d. 13 Oct 1930)
- Fionn Frances Bride (b. 9 Mar 1936)
- Hannah Frances (b. 29 Oct 1899, d. 16 May 1988)
- Henry (Charles?) (d. 1716)
- Hugh
- Hugh, (Earl) (d. 1616)
- John
- John Bruce Richard (b. 20 Dec 1780)
- Judith
- Louisa Henrietta Valdivia
- Margaret
- Margaret, (Lady)
- Mary (b. abt 1523)
- Mary (b. 1550)
- Mary Louisa Hermione (b. 19 Aug 1905, d. 1991)
- Matthew, (Baron) (d. 1558)
- Michael
- Neill, Sir
- Niall Oge (b. 1606, d. 1628)
- Penelope Ann (b. 15 Apr 1947)
- Phelim Robert Hugh
- Philim Robert Hugh (b. 2 Nov 1909, d. 1994)
- Raymond Arthur Clanaboy (b. 1 Sep 1933)
- Robert William Hugh (b. 8 Jun 1883, d. 1982)
- Rory (b. 1968)
- Rose
- Rose
- Rose Anne Mary, (Hon) (d. Sep 1976)
- Shane Edward Robert (b. 6 Feb 1907, d. 24 Oct 1944)
- Shane Sebastian Clanaboy (b. 25 Jul 1965)
- Sybil (b. 15 Dec 1902, d. 26 Jul 1946)
- Terence Marne (b. 10 Sep 1914, d. 1990)
- Tyrone (b. 1966)
- William
- William Thomas Cochrane (b. 16 Nov 1874, d. 24 Jul 1882)
- O'Reilly
- O'Reilly-Nugent
- O'Rorke
- O'Rouke
- O'Rourke
- O'Shaughnessy
- O'Shea
- O'Shee
- O'Sullivan
- O'Sullivan Beare
- O'Toole
- Oadham
- Mary (b. 26 Oct 1720, d. 4 Sep 1801)
- Oakden
- Oakeley
- Oakes
- Ada Mary (d. 1979)
- Dorothea Maria (b. 1826, d. Mar 1914)
- Elizabeth Jane
- Ellen Frances (b. 1836)
- Emily Gladys
- Emily Mary Charlotte
- Esmee Gertrude Bligh (b. 17 Jul 1887, d. 30 Dec 1936)
- Fany Augusta Maria
- Frances Charlotte Elisabeth (b. 1819, d. 1902)
- Frances Marian
- Georgiana (b. 1823, d. Jun 1913)
- Henrietta Matilda (b. 1821)
- Henry, (Sir) (b. 1756, d. 1827)
- Henry Frederick (b. 1818)
- Henry George or Alfred Ernest
- Henry James
- Henry Thomas, (Sir) (b. 1795, d. 1850)
- Lillian Mary (b. abt 1879, d. 18 Jun 1961)
- Mabel
- Margaret
- Margaret Kathleen Julia (d. 10 Feb 1951)
- Mary Ada
- Richard John Carey (d. 27 May 1929)
- Ry (b. abt 1810, d. Dec 1862)
- Sophia Louisa (b. 1828, d. 5 Feb 1910)
- William H
- William Thomas Smith
- Oakes Moore
- Oakes-Moore
- Oakins
- Oakleigh-Walker
- Oakley
- Oakley-Hill
- Oakshott
- Oaten
- Oates
- Oates I
- Oats
- Obbard
- Obeirne
- Obelensky
- Obins
- Obolenski
- Oborne
- Ochese
- Ochterlony
- Odam
- Odams
- Oddie
- Amy Isabella (b. 1847)
- Arthur Campbell (d. 21 Oct 1914)
- Beatrice Kate (d. 1952)
- Catherine (b. 1821, d. Sep 1897)
- Cecilia Ellen (b. Sep 1891)
- Claude Nevill (b. 1846, d. 1899)
- Edward (b. 1831, d. 1884)
- Ellen (d. 27 Feb 1870)
- Ellen (b. 1824, d. 1870)
- Fanny (b. 1823, d. 26 Feb 1904)
- Frances Margaret (b. 14 Jul 1903, d. 25 Dec 1989)
- George Augustus, (Rev) (b. 1820, d. 1877)
- Georgiana (b. 1814, d. 8 Mar 1843)
- Georgiana Mary (b. 1850)
- Georgina Madalen (b. Jun 1889, d. 1968)
- Henrietta (b. Mar 1888, d. 1934)
- Henry Hoyle (b. 1744, d. 1830)
- Henry Hoyle (b. 15 Jan 1779, d. 22 Sep 1847)
- Henry Hoyle (b. 1815, d. Jun 1869)
- Henry Hoyle (b. Dec 1845, d. Dec 1909)
- Henry Hoyle (b. Sep 1900, d. 1970)
- Isabella (b. 1820, d. Dec 1865)
- Jane (b. 1817, d. 1884)
- John (b. 1827, d. 1905)
- Katharine Mary (b. 1854, d. 1948)
- Marie Ernestine (b. Sep 1894, d. 1973)
- Mary Anne (b. 1816)
- Nevill Philip Arthur (b. 15 Feb 1884, d. 24 Oct 1958)
- Philip Francis (b. 1862, d. 1940)
- Walter (b. 1836)
- Oddin-Taylor
- Odell
- Alice (b. 1877, d. 1925)
- Brian E
- Catherine
- Catherine (b. 1776, d. 1858)
- Emily Bloomfield (b. 7 Sep 1848, d. 18 Feb 1876)
- John Westropp (b. 1874, d. 1936)
- Mary
- Mary Evelyn Westropp (b. 1876, d. 1954)
- Meliora Dorothea (b. 1 Dec 1845)
- Thomas
- Thomas Alexander (b. 1 Jun 1847, d. 25 Jan 1909)
- Thomas Henry (b. 3 Dec 1807, d. 22 Jan 1886)
- Vere Henry Hunt (b. 1851, d. 3 May 1897)
- Walter Lincoln (b. 1847, d. 1922)
- Walter Westropp (b. 1875, d. 1952)
- Odendaal