Last name Koy (Koy 
, コイ 
, Кой 
) , around the world, is quite a common surname. The last name Koy is habitual in Fiji, where it is quite a rare surname, Malaysia, and Iraq. Measured by absolute frequency, it is commonest in Iraq, Malaysia, and Indonesia. Likewise, Koy is the forename as well as the last name.
| tobias koy Hungarian court official and insect collector, AT (b. 1757) |
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ernie koy American baseball player, US (b. 1909) |
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| franciszek koy Polish officer (1893-1919), PL (b. 1893) |
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| toni koy German goldsmith and jeweler, known for work in amber, DE (b. 1896) |
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| josef koy (b. 1889) |
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jo koy American comedian, PH (b. 1971) |
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koy detmer American football player, US (b. 1973) |
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koy banal Filipino basketball coach |
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| james ah koy Fijian politician, FJ (b. 1936) |
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| ernie koy, jr. American football player, US (b. 1942) |
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| ted koy American football player, US (b. 1947) |
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| barbara de koy German actress, US (b. 1954) |
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adrian koy DE |
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| christopher erwin koy US (b. 1963) |
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| thorsten koy (b. 1964) |
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