Cognomen Grouchtchak (Грущак 
, Grouchtchak 
) , worldwide, is a rare last name. The surname Grouchtchak is characteristic of Ukraine, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Грущак | Kyrgyzstan, Kazakhstan, Ukraine, Russia |
| Grouchtchak | United States |