In Croatia, Gratelli families are Croats (from the Island of Brac ). In the past century, relatively most of Croatian residents bearing this family name were born on the Island of Brac.
Prevalence
Only a few people with faimily name Gratelli live in Croatia today, in one household only. They are located in only one small Croatian place, in Bol on the Island of Brac (<5).
Outside Croatia
Family name Gratelli is present in 6 countries on three continents.