In Croatia, Rosar families are predominantly Croats (from Porec area ), rarely Italians (also from Porec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Porec area.
Prevalence
Only a few people with faimily name Rosar live in Croatia today, in four households only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are only located in in one Croatian city and another small place , mostly in Visnjan in Porec area (<5) and Novigrad (<5).