Last name Koik (Koik 
) , throughout the world, is a rare cognomen. The cognomen Koik is habitual in Estonia, where it is quite a rare surname, Finland, where it is a rare surname, and Malaysia. In absolute terms, it most frequently occurs in India, Estonia, and Malaysia. Much less frequently, Koik is the forename as well as the last name.
| georg koik (b. 1855) |
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lembit koik Estonian journalist (1929-2017), EE (b. 1929) |
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| theodor koik Estonian politician, EE (b. 1888) |
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| kazuhiro koik (b. 1964) |
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| märt koik EE (b. 1990) |
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