Petanjek families are Croats and they are mostly from Zlatar area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zlatar area.
Prevalence
About 330 people with faimily name Petanjek live in Croatia today, in 140 households. There were 320 of them in the middle of the past century, and their number remains constant. They are located in 10 Croatian counties, in 18 cities and 33 other places, mostly in Zagreb (120), Veliki Komor in Zlatar area (30), Krapina (15), Sesvete (10), and in Polje Krapinsko (10).
Outside Croatia
Family name Petanjek is present in five countries on two continents.
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.