Last name Grynchuk (Гринчук 
, Grynchuk 
) , around the globe, is quite a common cognomen. The surname Grynchuk is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Гринчук | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Grynchuk | Romania, Czechia, Australia, Hungary, Ukraine |
| adam grynchuk Ukrainian Righteous Among the Nations, UA (b. 1902) |
|