Cognomen Korjak (Коряк 
, Korjak 
) , in the world, is quite a rare surname. The surname Korjak is habitual in Ukraine, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Коряк | Kyrgyzstan, Kazakhstan, Ukraine, Russia |
| Korjak | Israel |