Cognomen Sivuk (Sivuk 
, Сивук 
) , all around the world, is a rare family name. The surname Sivuk is characteristic of Belarus, where it is a rare surname, Ukraine, and Kazakhstan, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Eastern Europe, particularly Ukraine, Belarus, and Russia. Very seldom, Sivuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sivuk | Belarus, Russia, Argentina, Germany, Turkey |
| Сивук | Ukraine, Belarus, Kazakhstan, Russia |