Kolak families are Croats and they are mostly from Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Tomislavgrad area) and in Zagreb. In Lužani in Cazins Region (Bosnia) every fifth inhabitant had the family name Kolak.
About 1200 people with faimily name Kolak live in Croatia today, in 460 households. There were 540 of them in the middle of the past century, and their number doubled. They are located in almost all Croatian counties, in 52 cities and 97 other places, mostly in Zagreb (255), Sesvete (50), Split (50), Osijek (40), and in Vukovar (35).