Cognomen Šljaka (Šljaka 
, Schlacke 
) , around the world, is a rare family name. The surname Šljaka is habitual in Croatia, where it is a rare surname, Germany, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Šljaka | Croatia |
| Schlacke | Germany, United States |