Kučak families are Croats and they are mostly from Donja Stubica area. In the past century, relatively most of Croatian residents bearing this family name were born in Donja Stubica area and in Zagreb.
Prevalence
About 90 people with faimily name Kučak live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number increased by 20 percent. They are located in 7 Croatian counties, in 7 cities and 7 other places, mostly in Zagreb (35), Stubicke Toplice in Oroslavje area (15), Modrovec in Donja Stubica area (15), Oroslavje (<10), and in Osijek (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.