Mušnjak families are Croats and they are mostly from Duga Resa area. In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Zagreb.
Prevalence
About 60 people with faimily name Mušnjak live in Croatia today, in 20 households. There were 70 of them in the middle of the past century, and their number decreased by 10 percent. They are located in threee Croatian counties and threee other places, mostly in Karlovac (20), Zagreb (20), Donji Velemeric in Duga Resa area (10), Ribari (<10), and in Rijeka (<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.