Cognomen Сопільнюк (Сопільнюк 
) , all over the world, is an extremely rare family name. The surname Сопільнюк is characteristic of Eastern Europe, particularly Ukraine, where it is an extremely rare surname. Very seldom, Сопільнюк is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Сопільнюк | Ukraine |