In Croatia, Gršak families are generally Croats (from Karlovac ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Zabok.
About 20 people with faimily name Gršak live in Croatia today, in 8 households. There were 40 of them in the middle of the past century, and their number halved. They are located in only four naselja i to in Karlovac (10), Okic (<5), Zabok (<5), and in Veliki Erjavec (<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.