Cognomen O'Conor (O'Conor 
, オコナー) , all over the world, is a rare last name. The family name O'Conor is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and Nicaragua. Not in comparison with a country's population, it is the most numerous in Ireland, the United States, and Australia. Very seldom, O'Conor is the forename as well as the last name.
| cathal o'conor (1597-1634) (b. 1597) |
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| denis o'conor (born 1674) (b. 1674) |
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| denis o'conor (1732-1804) (b. 1732) |
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| charles o'conor (1736-1808) (b. 1736) |
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denis o'conor British politician (1794-1847) (b. 1794) |
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charles o'conor American lawyer (1804-1884), US (b. 1804) |
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| owen o'conor 1763 - 1831 (Mr) (b. 1763) |
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| owen o'conor, o'conor don (1763-1831) (b. 1763) |
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| charles o'conor Irish priest and writer (1764-1828), IE (b. 1764) |
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| denis o'conor (born 1770) (b. 1770) |
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| roderick o'conor (born 1772) (b. 1772) |
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| matthew o'conor Irish barrister and historical writer, IE (b. 1773) |
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charles owen o'conor British politician (1838-1906), IE (b. 1838) |
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| roderic o'conor (1791-1879) (b. 1791) |
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nicholas roderick o'conor British diplomat, IE (b. 1843) |
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