Surname Girnyak (Girnyak 
, Гирняк 
) , around the world, is a rare last name. The surname Girnyak is characteristic of Ukraine, where it is a rare surname, Russia, and Kazakhstan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Girnyak | Spain, Ukraine, United States, Russia |
| Гирняк | Kazakhstan, Russia, Ukraine |