Mušac families are Croats and they are mostly from Omis. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Omis.
Prevalence
About 80 people with faimily name Mušac live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number increased by 40 percent. They are located in four Croatian counties, in 7 cities and 6 other places, mostly in Omis (40), Osijek (10), Dugi Rat in Omis area (10), Split (<10), and in Celina (<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.