Cerjak families are Croats and they are mostly from Glina. In the past century, relatively most of Croatian residents bearing this family name were born in Glina and Sisak.
Prevalence
About 240 people with faimily name Cerjak live in Croatia today, in 110 households. There were 300 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 16 cities and 30 other places, mostly in Zagreb (40), Petrinja (25), Topolovac (15), Gredjani in Glina area (15), and in Sisak (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.