Surname Korniyuk (Korniyuk 
, Корниюк 
) , in the entire world, is a rare family name. The surname Korniyuk is habitual in Belarus, where it is a rare surname, Russia, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Korniyuk | Kazakhstan, Russia, United States, Canada, Ukraine |
| Корниюк | Kazakhstan, Russia, Ukraine, Belarus |