Surname Stepaniouk (Степанюк 
, Stepaniouk 
) , all around the world, is a common cognomen. The surname Stepaniouk is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Russia, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Степанюк | Azerbaijan, Kazakhstan, Russia, Belarus, Ukraine |
| Stepaniouk | Germany, Finland, Canada, United States |