Brežnjak 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 Ivanec and Pregrada. In places Margečan , Osečka and Željeznica in Ivanec every tenth inhabitant had the family name Brežnjak.
Prevalence
About 250 people with faimily name Brežnjak live in Croatia today, in 100 households. There were 130 of them in the middle of the past century, and their number doubled. They are located in the most of Croatian counties, in 18 cities and 27 other places, mostly in Radovan (35), Zeljeznica (20), Osecka (15), Bregi Kostelski (15), and in Pregrada (15).
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.