Family name Mlacak (Mlacak 
) , globally, is a very rare last name. The surname Mlacak is habitual in Slovenia, where it is a rare surname, Slovakia, and Croatia, where it is a very rare surname. In absolute terms, the name is most common in Slovakia, Argentina, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Mlacak | Croatia, Argentina, Canada, Slovenia, Slovakia |
| john mlacak Canadian painter (1936-2014), CA (b. 1936) |
|