In Croatia, Sossa families are predominantly Italians (from Umag ), rarely Bosniaks (also from Umag ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia.
Prevalence
About 10 people with faimily name Sossa live in Croatia today, in three households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only two naselja i to in Vardica (<10) and Umag (<5).
Outside Croatia
Family name Sossa is present in 52 countries worldwide.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.