Petak families are Croats and they are mostly from Ivanec. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Zagreb.
Prevalence
About 730 people with faimily name Petak live in Croatia today, in 290 households. There were 770 of them in the middle of the past century, and their number decreased by 10 percent. They are located in the most of Croatian counties, in 30 cities and 87 other places, mostly in Zagreb (105), Jerovec (70), Bedenec (40), Varazdin (40), and in Priles in Ludbreg area (30).
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.