Sosa families are Croats and they are mostly from Bosnian Krajina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosnian Krajina (Sipovo area) and in Imotsko.
Prevalence
About 80 people with faimily name Sosa live in Croatia today, in 30 households. There were 20 of them in the middle of the past century, and their number multiplied. They are located in 7 Croatian counties, in 7 cities and 8 other places, mostly in Zagreb (25), Split (15), Imotski (10), Cisla (<10), and in Zmijavci in Imotski area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.