Family name Krivulyak (Krivulyak 
, Кривуляк 
) , across the world, is a rare surname. The surname Krivulyak is habitual in Eastern Europe, particularly Ukraine, where it is a rare surname, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Krivulyak | Russia |
| Кривуляк | Russia, Ukraine |