Kušter families are Croats and they are mostly from Varazdin area. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Ivanec. In Ledinec in Varazdin area every sixth inhabitant had the family name Kušter.
Prevalence
About 430 people with faimily name Kušter live in Croatia today, in 160 households. There were 400 of them in the middle of the past century, and their number increased by 10 percent. They are located in the most of Croatian counties, in 22 cities and 48 other places, mostly in Varazdin (70), Beretinec in Varazdin area (40), Zagreb (40), Ivanecki Vrhovec (25), and in Ivanec (20).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.