In Croatia, Rosič families are Croats by relative majority, equally Slovenes (from Slovenia ). In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia.
Prevalence
Only a few people with faimily name Rosič live in Croatia today, in one household only. They are located in one Croatian city only, in Rijeka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1750 in source 18th Century Census.