Around the globe, Cosby (Cosby 
, كوسبي) is a rare primarily boy's, but very seldom female first name. The first name Cosby is characteristic of Cameroon, where it is a rare boy's name, the Democratic Republic of the Congo, and the United States, where it is a very rare dominantly male, but infrequently girly name. More frequently, Cosby is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Cosby | United Kingdom, Ghana, United States, Canada, Democratic Republic of the Congo |
| dudley cosby (1662-1729) (b. 1662) |
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phillips cosby Royal Navy admiral (1729-1808) (b. 1729) |
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dudley cosby, 1st baron sydney Irish politician (b. 1730) |
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| pole cosby (1703-1766) (b. 1703) |
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| philipps cosby (b. 1727) |
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| sir henry augustus montague cosby (1743-1822) (b. 1743) |
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| dudley cosby (1761-1789) (b. 1761) |
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| dabney cosby American architect, US (b. 1793) |
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| wellesley pole cosby (1809-1842) (b. 1809) |
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spencer cosby U.S. Army officer (b. 1867) |
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dabney cosby American politician, US (b. 1879) |
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| dudley sydney ashworth cosby Irish army officer, and writer on Irish and social questions (b. 1862) |
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quan cosby American football player, US (b. 1982) |
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| dudley eric sydney cosby (1936-1973) (b. 1936) |
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| ennis cosby son of Bill Cosby, US (b. 1969) |
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