In Croatia, Kuštrak families are almost entirely Croats (from Djurdjevac area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac area and in Zagreb.
Prevalence
About 30 people with faimily name Kuštrak live in Croatia today, in 13 households. There were 40 of them in the middle of the past century, and their number decreased by 20 percent. They are located in four Croatian counties, four cities and two other places, mostly in Zagreb (20), Velika Gorica (<5), Virje in Djurdjevac area (<5), Djurdjevac (<5), and in Split (<5).
Outside Croatia
Family name Kuštrak (including: Kustrak , Chustrak ) is present in five countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1936 in source Emigration Commission Zagreb.