Surname Cogan (Cogan 
, 科根 
, Коган 
) , worldwide, is a common cognomen. The last name Cogan is habitual in Israel, where it is quite a common surname, Ireland, and Russia, where it is quite a rare surname. In absolute terms, it is commonest in Russia, the United States, and Israel. Very seldom, Cogan is the forename as well as the last name.
| john de cogan Anglo-Irish knight (b. 1233) |
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| john de cogan Peerage person ID=155616 (b. 1243) |
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| thomas cogan English physician (1545?–1607), GB (b. 1545) |
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| frances cogan (1605-1671) (b. 1605) |
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| william cogan English apothecary and philanthropist (b. 1677) |
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thomas cogan English physician (1736–1818), GB (b. 1736) |
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| philip cogan Irish composer, IE (b. 1750) |
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| eliezer cogan British scholar (b. 1762) |
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| edward cogan 1803-1884 , coin dealer (b. 1803) |
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william n. cogan United States Navy officer and dentist (1856-1943), US (b. 1856) |
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| william cogan Irish politician (b. 1823) |
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| dean cogan Irish historian (b. 1826) |
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| john daniel cogan (b. 1818) |
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| denis cogan Irish politician (b. 1859) |
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| fanny cogan American actress, US (b. 1866) |
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