Cognomen Koziichuk (Koziichuk 
, Козийчук 
) , in the world, is a very rare family name. The last name Koziichuk is habitual in Kazakhstan, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Koziichuk | Ukraine |
| Козийчук | Kazakhstan, Russia, Ukraine |