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Surname Kolak (Kolak , Колак , קולאק ) , in the world, is quite a common last name. The surname Kolak 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. Measured by absolute frequency, it is commonest in Turkey, Croatia, and India. Much less frequently, Kolak is the forename as well as the last name.