In Croatia, Rosatti families are Croats (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka.
Prevalence
Only a few people with faimily name Rosatti 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 Rijeka (<5) and Kastav (<5).
Outside Croatia
Family name Rosatti is present in 19 countries worldwide.