Surname Fostyak (Fostyak 
, Фостяк 
) , all around the world, is a rare family name. The last name Fostyak is habitual in Ukraine, where it is quite a rare surname, Kazakhstan, where it is a very rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Fostyak | Ukraine |
| Фостяк | Kazakhstan, Ukraine, Russia |
| khrystyna fostyak AT |
|