In Croatia, Mrau families are mainly Croats (from Umag ), less frequently Italians (also from Umag ). In the past century, relatively most of Croatian residents bearing this family name were born in Umag and in Slovenia.
Prevalence
About 10 people with faimily name Mrau live in Croatia today, in four households only. They are located in only threee naselja i to in Savudrija (<10), Murine (<5), and in Umag (<5).
Outside Croatia
Family name Mrau is present in 9 countries on four continents.