In Croatia, Petaj families are Croats (from Novi Marof area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zabok and in Lepoglava area.
Prevalence
About 20 people with faimily name Petaj live in Croatia today, in 7 households. There were 30 of them in the middle of the past century, and their number decreased by 40 percent. They are located in four Croatian counties, two cities and four other places, mostly in Bedekovcina in Lepoglava area (<10), Vinicno in Novi Marof area (<10), Sesvete (<5), Sracinec in Varazdin area (<5), and in Husinec in Novi Marof area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.