In Croatia, Breznjak families are Croats by relative majority (from Backa, Vojvodina ), equally Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Backa, Vojvodina.
Prevalence
Only a few people with faimily name Breznjak live in Croatia today, in one household only. They are located in one Croatian city only, in Osijek (<5).
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.