In Croatia, Vuišak families are Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area. In Gorička in Hrvatska Kostajnica area every thirtieth inhabitant had the family name Vuišak.
Prevalence
Only a few people with faimily name Vuišak live in Croatia today, in five households only. There were 20 of them in the middle of the past century, and their number halved. They are located in only threee Croatian places: in Goricka in Hrvatska Kostajnica area (<10), Mirkovci (<5), and in Zagreb (<5).
Outside Croatia
Family name Vuišak is present in this form only in Croatia.