In Croatia, Polšak families are almost entirely Croats (from Samobor ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Bjelovar and Zagreb.
Prevalence
About 30 people with faimily name Polšak live in Croatia today, in 13 households. There were 60 of them in the middle of the past century, and their number halved. They are located in 6 Croatian counties, in 7 cities and another small place , mostly in Zagreb (<10), Samobor (<10), Sisak (<5), Bjelovar (<5), and in Rijeka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.