In Croatia, Južak families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sisak.
Prevalence
About 10 people with faimily name Južak live in Croatia today, in four households only. They are located in only five naselja i to in Velika Gorica (<5), Stupno (<5), Zagreb (<5), Vukovina (<5), and in Setus in Sisak area (<5).
Outside Croatia
Family name Južak (including: Juzak , Yuzak , Yuzhak and Lyuzak ) is present in 14 countries on four continents.