In Croatia, Grasso families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and on the Island of Losinj.
Prevalence
Only a few people with faimily name Grasso live in Croatia today, in two households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in two Croatian cities only, in Zagreb (<10) and Mali Losinj on the Island of Losinj (<5).
Outside Croatia
Family name Grasso is present in 63 countries worldwide. The family name "Grasso " is used by some 30000 people in Italy , about 10000 in the United States , and some 7000 people in Argentina.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.