In Croatia, Voljak families are Croats (from Jastrebarsko ). In the past century, relatively most of Croatian residents bearing this family name were born in Jastrebarsko and Zagreb.
Prevalence
About 10 people with faimily name Voljak live in Croatia today, in 7 households. They are located in two Croatian counties, four cities and threee other places, mostly in Orle in Ivanic-Grad area (<10), Rastoki (<5), Zagreb (<5), Velika Gorica (<5), and in Gorica Svetojanska (<5).
Outside Croatia
Family name Voljak (including: Volyak , Volyakh and Voliak ) is present in 9 countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.