In Croatia, Neffat families are predominantly Croats (from Rijeka area ), rarely Italians. In the past century, relatively most of Croatian residents bearing this family name were born in Porec.
Prevalence
Only a few people with faimily name Neffat live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number decreased significantly. They are located in only threee naselja i to in Drazice in Rijeka area (<5), Tar (<5), and in Jelenje in Rijeka area (<5).
Outside Croatia
At least one family with this surname emigrated from Croatia to the United States. Family name Neffat is present in five countries on two continents.
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.