In Croatia, Fusak families are Croats (from Krizevci ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Krizevci.
Prevalence
Only a few people with faimily name Fusak live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number halved. They are located in two Croatian cities only, in Zagreb (<5) and Krizevci (<5).
Outside Croatia
Family name Fusak is present in two countries on two continents. The family name "Fusak " is used by small number of people in the United States.