Heršak families are Croats and they are mostly from Zagreb. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Cazma area.
Prevalence
About 70 people with faimily name Heršak live in Croatia today, in 30 households. There were 90 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 8 Croatian counties, in 6 cities and 9 other places, mostly in Zagreb (35), Krapinske Toplice in Krapina area (<10), Poljanski Lug (<10), Bjelovar (<5), and in Zapresic (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.