In Croatia, Mattuglia families are predominantly Italians (from Opatija area ), rarely Croats.
Prevalence
Only a few people with faimily name Mattuglia live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in only one small Croatian place, in Matulji in Opatija area (<5).
Outside Croatia
Family name Mattuglia is present in three countries.
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.