Petrek families are Croats and they are mostly from Cazma area. In the past century, relatively most of Croatian residents bearing this family name were born in Cazma area and in Zagreb.
Prevalence
About 90 people with faimily name Petrek live in Croatia today, in 40 households. There were 140 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 7 Croatian counties, in 9 cities and 11 other places, mostly in Zapresic (15), Klostar Ivanic in Ivanic-Grad area (10), Zagreb (<10), Celine (<10), and in Krizevci (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.