In Croatia, Portak families are Croats (from Bosnian Posavina ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Slavonski Brod.
Prevalence
Only a few people with faimily name Portak live in Croatia today, in four households only. They are located in two Croatian cities only, in Zagreb (<5) and Slavonski Brod (<5).