Last name Kutniak (Kutniak 
, Кутняк 
) , in the world, is quite a rare surname. The surname Kutniak is characteristic of Eastern Europe, particularly Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Belarus. Not in comparison with a country's population, it is the most numerous in Ukraine, Russia, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Kutniak | United States, France, Belarus, Estonia |
| Кутняк | Kazakhstan, Russia, Ukraine, Belarus |