Špionjak families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Bosanski Samac area) and in Djakovo area.
Prevalence
About 150 people with faimily name Špionjak live in Croatia today, in 50 households. They are located in 7 Croatian counties, in 10 cities and 14 other places, mostly in Slavonski Samac in Zupanja area (30), Vinkovci (25), Gundinci in Djakovo area (25), Babina Greda in Zupanja area (25), and in Zupanja (20).
Outside Croatia
Family name Špionjak is present in this form only in Croatia.