In Croatia, Kršak families are Croats (from Sveti Ivan Zelina ). In the past century, relatively most of Croatian residents bearing this family name were born in Sveti Ivan Zelina and Zagreb.
Prevalence
About 40 people with faimily name Kršak live in Croatia today, in 15 households. There were 50 of them in the middle of the past century, and their number decreased by 30 percent. They are located in four Croatian counties and 6 other places, mostly in Zagreb (<10), Sveta Helena (<10), Hrnjanec (<10), Gornja Drenova (<5), and in Valpovo (<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.