In Croatia, Russo families are Croats (from Trogir ). In the past century, relatively most of Croatian residents bearing this family name were born in Trogir and Split.
Prevalence
About 60 people with faimily name Russo live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number remains constant. They are located in 7 Croatian counties, in 9 cities and 6 other places, mostly in Trogir (20), Zagreb (<10), Split (<10), Kastel Stari (<10), and in Mali Losinj on the Island of Losinj (<10).
Outside Croatia
Family name Russo (including: Russso , Ruesso ) is present in 130 countries worldwide. The family name "Russo " is used by some 100000 people in Italy , about 60000 in the United States , and some 40000 people in Brazil. "Ruesso " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1932 in source Emigration Commission Zagreb.