Family name Слук (Sluk 
, Слук 
) , across the world, is a rare cognomen. The cognomen Слук is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine, where it is a very rare surname. In absolute terms, it is commonest in Slovakia, the United States, and Belarus. Much less frequently, Слук is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sluk | Germany, Slovakia, United States, Israel, India |
| Слук | Belarus, Russia, Ukraine |