In Croatia, Kušterbajn families are Croats (from Vrbovec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Vrbovec area. In Zvekovac in Vrbovec area every thirtieth inhabitant had the family name Kušterbajn.
Prevalence
About 10 people with faimily name Kušterbajn live in Croatia today, in four households only. They are located in only two Croatian places: in Zvekovac in Vrbovec area (10) and Sibenik (<5).
Outside Croatia
Family name Kušterbajn is present in this form only in Croatia.