In Croatia, Peroša families are predominantly Italians (from Buje ), rarely Croats (also from Buje ). In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia and in Buje.
Prevalence
About 20 people with faimily name Peroša live in Croatia today, in 9 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in two Croatian counties and two other places, mostly in Labin (<10), Novigrad (<10), Buje (<5), Kastel (<5), and in Zagreb (<5).
Outside Croatia
Family name Peroša (including: Perosa , Perossa ) is present in 18 countries worldwide. "Perossa " is used by some 200 people in Italy , about 200 in Argentina , and small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.