Cognomen קולאק (Kolak 
, Kullak 
, קולאק 
) , across the world, is quite a common family name. The surname קולאק is habitual in Southern Europe, particularly Croatia, where it is quite a common surname, Bosnia and Herzegovina, and Serbia, where it is quite a rare surname. In absolute terms, it most frequently occurs in Turkey, Croatia, and India. Very seldom, קולאק is the forename as well as the last name.