Last name Kobyak (Kobyak 
, Кобяк 
) , in the world, is a rare family name. The surname Kobyak is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Russia, where it is a rare surname, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Kobyak | Russia, Belarus |
| Кобяк | Kazakhstan, Russia, Ukraine, Belarus |