In Croatia, Petroša families are generally Croats (from Zadar ), very rarely Bosniaks (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and Rijeka.
Prevalence
About 20 people with faimily name Petroša live in Croatia today, in 10 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Zadar (10), Pula (<5), Zagreb (<5), and in Brgulje (<5).
Outside Croatia
At least one family with this surname emigrated from Croatia to the United States. Family name Petroša (including: Petrosa , Petroschak ) is present in 9 countries on three continents. The family name "Petrosa " is used by small number of people in the United States and small number in Indonesia.
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.