Surname Grenchuk (Grenchuk 
, Гренчук 
) , worldwide, is a rare family name. The surname Grenchuk is characteristic of Ukraine, where it is a rare surname, Russia, where it is a very rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Grenchuk | Canada, United States, Ukraine |
| Гренчук | Russia, Kazakhstan, Ukraine |