Surname Karpjak (Карпяк 
, Karpjak 
) , all around the world, is quite a rare family name. The cognomen Karpjak is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Ukraine, and Russia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Карпяк | Kazakhstan, Ukraine, Belarus, Russia |
| Karpjak | United States, Slovakia |