In Croatia, Isak families are mainly Croats (from the Island of Rab ), rarely Bosniaks (from Western Bosnia ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Tomislavgrad area) and in Zagreb.
Prevalence
Only a few people with faimily name Isak live in Croatia today, in four households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in four Croatian cities only: in Split (<5), Zagreb (<5), Supetarska Draga on the Island of Rab (<5), and in Grabovac Banski (<5).
