Patljak families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Modrica area) and in Bosanian Posavina (Gradacac area). In Kladari Gornji in Bosanian Posavina every fourth inhabitant had the family name Patljak.
Prevalence
About 90 people with faimily name Patljak live in Croatia today, in 30 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in 7 Croatian counties, in 9 cities and 10 other places, mostly in Zagreb (30), Lovrecka Velika (15), Celine (10), Koprivnicki Ivanec in Koprivnica area (<10), and in Dreznik Brezovicki (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.