Hrženjak families are Croats and they are mostly from Ivanec area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Varazdin.
Prevalence
About 910 people with faimily name Hrženjak live in Croatia today, in 350 households. There were 910 of them in the middle of the past century, and their number remains constant. They are located in almost all Croatian counties, in 42 cities and 125 other places, mostly in Zagreb (120), Varazdin (60), Virje in Djurdjevac area (50), Zlogonje (40), and in Koprivnica (30).
Outside Croatia
Family name Hrženjak is present in two countries on two continents. The family name "Hrzenjak " is used by small number of people in the United States.
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.