Cognomen Kostyniuk (Kostyniuk 
, Костынюк 
, Костинюк 
) , across the world, is quite a rare surname. The cognomen Kostyniuk is characteristic of Ukraine, where it is quite a rare surname, Canada, where it is a rare surname, and Russia. Much less frequently, Kostyniuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kostyniuk | Canada, United States, Venezuela, Germany, Poland |
| Костынюк | Belarus, Russia, Kazakhstan |
| Костинюк | Russia, Ukraine, Kazakhstan |
| mikołaj kostyniuk botanist (1908-1975), PL (b. 1908) |
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| daniel j kostyniuk researcher |
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| lidia p kostyniuk researcher (ORCID 0000-0002-9704-6392) |
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