- Oison
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John d' d. 1512William d' d. c 1503
- Oisy
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Sire d', in the district of Marle (Enguerrand VII) b. c 1339, d. 18 Feb 1397
- Oja
- Ojeda
- Okamoto
-
Kristine Alicia b. 2 Mar 1968
- Oke
- Okeby
-
Honoria Agnes b. c 1894, d. 24 Jul 1973Honoria Agnes b. 1894, d. 27 Jul 1973
- Okeden
-
Herbert George d. b 1963Mabel Elizabeth b. 6 Jul 1885, d. 23 May 1957
- Okehampton
-
Lord of (Hugh) b. 25 Mar 1249, d. 28 Feb 1291/92Lord of (Robert) d. 26 Jul 1242
- Okeley
- Okell
-
Jane b. 10 Mar 1749
- Oken
-
Caragh Seymour b. 20 Feb 1933
- Okenhampton
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Baron of (Robert) b. 1093, d. 31 May 1172Matilda of d. 21 Sep 1173
- Okeover
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Anne Wilberforce d. 9 Dec 1967Bridget d. 1784Catherine d. 18 Oct 1672Catherine d. 1713Charles Gregory b. 11 May 1792, d. 2 Aug 1826Edith Mary d. 4 Sep 1935Edward d. 30 Jun 1793Edward d. 30 Jun 1793Eliza Anne b. 4 Apr 1838, d. 11 Dec 1921Elizabeth d. Oct 1705Elizabeth b. 1492Elizabeth b. 1703, d. 1774Ethel Blanche d. 17 Mar 1935Haughton Charles b. 13 Nov 1825, d. 20 Oct 1912Haughton Ealdred b. 10 May 1875, d. 22 Jan 1955Haughton Farmer b. 7 Sep 1776, d. 18 Jul 1836Henry b. 28 Jan 1654Hugh d. 1242Humphrey d. 5 Apr 1538Humphrey b. 1609, d. 30 Dec 1639Humphrey b. 29 May 1648, d. b 1692Jane d. 3 Feb 1524Leake b. 1701, d. 31 Jan 1765Mabel Alice d. 21 Jul 1938Margery d. 15 Feb 1579Mary d. 1764Mary Anne d. 6 Feb 1842Mary Anne b. 28 Jan 1803, d. 1875Mary Beatrice d. 13 Jan 1889Maude d. 1 May 1943Mercy Lilian d. 16 Oct 1936Patience d. 25 Jul 1741Philip d. 1604Philip b. c 1490, d. 1536Ralph d. 9 Oct 1495Ralph d. b 1538Ralph b. 1524, d. 29 Mar 1571Richard d. b 1204Robert d. a 1241Roger d. b Apr 1338Rowland d. 7 May 1610Rowland d. 1761Rowland d. 16 Nov 1792Rowland b. 19 Jul 1624, d. 1692Rowland b. 21 Sep 1651, d. 1730Rowland Farmer b. 1745, d. 3 Jan 1793Ruth Isabel d. 27 Sep 1915Sarra d. a 1241Thomas d. b Jun 1372Thomas d. 4 Jan 1460Thomas d. 1439Thomas b. 10 Jan 1657, d. 1705Thomas b. 28 Mar 1679, d. 1710Victoria Alexandrina d. 2 Nov 1960William d. Sep 1748
- Okes
- Okey
- Okill
-
Jane b. 8 Jul 1747, d. 10 Jun 1821
- Okolisczanyi
- Okolo
-
James d. 4 May 2010
- Oksanen
- Oktaviani
- Okun
- Okuno
-
Catherine Dorinda b. 25 Feb 1937Marcus Horishi b. 6 Mar 1963Mary Mitsu b. 12 Dec 1969Richard Makoto b. 5 Feb 1962
- ol-Molouk
- Olafsdottir
- Olafson
-
Valthjof d. 1135
- Olafsson
-
Magnus 'the Barefoot' b. 1073, d. 1103
- Olah de Kis-Baratfalva
-
Laszlo Miklos Geza b. 26 Sep 1966Maria Assunta b. 1934
- Olah
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Eszter b. 28 Nov 1957
- Olavson
-
Magnus, King of Man d. 1265
- Olavsson
-
Magnus 'the Barefoot' b. 1073, d. 1103Magnus III, King of Norway b. 1073, d. 1103
- Olazábal y Churruca
- Olberg
- Olbreuse
-
Alexandre d' d. c 1622Alexandre II d' d. a 1667Louis d' d. b 26 Sep 1586
- Olby
- Olcott
-
Gladys b. 1904
- Old
-
Amanda Mary Perceval b. 21 Jun 1966Amanda Norah Mildred b. 14 Jun 1939Andrew b. 29 Jun 1967Anthony Richard b. 13 Feb 1994Avis Lesley b. fr Jan 1933 - Mar 1933Beatrice Mary b. 13 May 1942Bonnie Dawn b. 9 Mar 1925Bonnie Joye b. 13 Apr 1949Charles Arthur b. 3 Dec 1953Charles Donald b. 30 Jul 1916, d. 3 Nov 1978Jessica Anne b. 19 Sep 1996Judith Faye b. c 1946Nicola Noel b. 25 Sep 1971Rachel b. 4 Nov 1964Sarah b. 1971Sheila de Courcy b. 6 Jun 1918
- Oldacre
- Oldbury
-
Dorothy d. 1717Mary d. 3 Apr 1740
- Oldcastell
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1st Lord (John) d. 14 Dec 1417Joan d. 13 Jan 1433/34John, 1st and last Lord Oldcastell d. 14 Dec 1417
- Oldcastle