Roso families are Croats and they are mostly from Vrgorac. In the past century, relatively most of Croatian residents bearing this family name were born in Vrgorac and in Herzegovina (Grude area). In places Mijaca and Zavojane in Vrgorac every fourth inhabitant had the family name Roso.
Prevalence
About 1100 people with faimily name Roso live in Croatia today, in 390 households. There were 440 of them in the middle of the past century, and their number more than doubled. They are located in the most of Croatian counties, in 32 cities and 62 other places, mostly in Makarska (260), Zagreb (95), Osijek (85), Split (80), and in Orebic on the Peljesac peninsula (65).
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.