Cognomen Reznichuk (Reznichuk 
, Резничук 
) , worldwide, is a rare surname. The last name Reznichuk is habitual in Belarus, where it is a rare surname, Ukraine, and Kazakhstan, where it is a very rare surname. In absolute terms, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Reznichuk | Russia, Ukraine |
| Резничук | Kazakhstan, Ukraine, Belarus, Russia |