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, Canada, United States, Russia, Ukraine |
| Корниюк | Russia, Ukraine, Kazakhstan, Belarus |