Last name Kornutiak (Kornutiak 
, Корнутяк 
) , in the world, is a rare surname. The last name Kornutiak is habitual in Ukraine, where it is a rare surname, Russia, where it is a very rare surname, and Canada, where it is an extremely rare surname. In absolute terms, it is commonest in Ukraine, Russia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Kornutiak | Canada, United States |
| Корнутяк | Ukraine, Russia |