Petek families are Croats and they are mostly from Klanjec. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Klanjec. In Letovčan Novodvorski in Klanjec every third inhabitant had the family name Petek.
Prevalence
About 1200 people with faimily name Petek live in Croatia today, in 490 households. There were 1300 of them in the middle of the past century, and their number decreased by 10 percent. They are located in almost all Croatian counties, in 49 cities and 153 other places, mostly in Zagreb (230), Letovcan Novodvorski (45), in Jezerisce (40) and Djurmanec (35) in Krapina area, and in Cakovec (25).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.