In Croatia, Scaglia families are Croats (from Rijeka ).
Prevalence
Only a few people with faimily name Scaglia live in Croatia today, in two households only. They are located in two Croatian cities only, in Zagreb (<5) and Rijeka (<5).
Outside Croatia
Family name Scaglia is present in 32 countries worldwide.
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.