In Croatia, Mustak families are almost entirely Croats (from Beli Manastir area ), very rarely Slovenes (from Cakovec ). In the past century, relatively most of Croatian residents bearing this family name were born in Prelog and Cakovec.
Prevalence
About 30 people with faimily name Mustak live in Croatia today, in 15 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, four cities and 6 other places, mostly in Kozarac in Beli Manastir area (10), Prelog (<10), Cakovec (<10), Nedelisce in Cakovec area (<5), and in Ceminac in Beli Manastir area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.