In Croatia, Geršak families are generally Croats (from Klanjec area ), very rarely Serbs, and barely Slovenes (also from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Slovenia. In Miljana in Klanjec area every sixth inhabitant had the family name Geršak.
Prevalence
About 70 people with faimily name Geršak live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 6 Croatian counties, in 10 cities and 8 other places, mostly in Zagreb (25), Miljana in Klanjec area (15), Sesvete (<10), Velika Gorica (<5), and in Velika Mlaka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.