Last name Korniak (Korniak 
, Корняк 
) , in all the world, is a rare family name. The cognomen Korniak is characteristic of Lithuania, where it is a rare surname, Poland, and Ukraine. In absolute terms, it most frequently occurs in Eastern Europe, particularly Poland, Russia, and Ukraine. Likewise, Korniak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Korniak | France, Lithuania, Italy, Poland, United States |
| Корняк | Kazakhstan, Russia, Ukraine |
| antoni korniak Polish dermatologist and venerologist, PL (b. 1931) |
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| andrzej korniak Polish sportsperson and athletics competitor, PL (b. 1953) |
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