In Croatia, Derosi families are almost entirely Croats (from Labin ), barely Italians (also from Labin ). In the past century, relatively most of Croatian residents bearing this family name were born in Labin and Pula.
Prevalence
About 40 people with faimily name Derosi live in Croatia today, in 20 households. There were 100 of them in the middle of the past century, and their number decreased significantly. They are only located in threee Croatian cities and 8 other places, mostly in Labin (15), Strmac in Labin area (15), Vinez (<10), Rabac (<5), and in Presika (<5).
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.