Svržnjak families are Croats and they are mostly from Lepoglava area. In the past century, relatively most of Croatian residents bearing this family name were born in Lepoglava area and in Zagreb.
Prevalence
About 150 people with faimily name Svržnjak live in Croatia today, in 60 households. There were 170 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 7 Croatian counties, in 9 cities and 21 other places, mostly in Zagreb (30), Koprivnica (20), Jezovec in Lepoglava area (15), Varazdin (10), and in Breznica Nasicka in Nasice area (<10).
Outside Croatia
Family name Svržnjak is present in this form only in Croatia.
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.