Cognomen Stadnychuk (Stadnychuk 
, Стадничук 
) , in the entire world, is a rare last name. The surname Stadnychuk is characteristic of Eastern Europe, particularly Ukraine, where it is a rare surname, Belarus, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Stadnychuk | Canada |
| Стадничук | Kazakhstan, Russia, Ukraine, Belarus |