In Croatia, Muss families are Croats (from Karlovac ). In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac.
Prevalence
Only a few people with faimily name Muss live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in two Croatian cities only, in Karlovac (<5) and Pula (<5).
Outside Croatia
Family name Muss (including: Muuss , Muess ) is present in 56 countries worldwide. "Muuss " is used by some 200 people in Germany and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.