Cognomen Kornijchuk (Kornijchuk 
, Корнийчук 
) , across the world, is a rare last name. The family name Kornijchuk is habitual in Russia, where it is a rare surname, Belarus, and Kazakhstan. Not in comparison with a country's population, this name is the most popular in Russia, Kazakhstan, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Kornijchuk | Ukraine, Canada |
| Корнийчук | Belarus, Ukraine, Russia, Kazakhstan |
| aleksander arkadievich kornijchuk RU (b. 1955) |
|