In Croatia, Fio families are Croats (from the Island of Hvar ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Zabok.
Prevalence
About 30 people with faimily name Fio live in Croatia today, in 14 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties and two other places, mostly in Zagreb (<10), Hvar on the Island of Hvar (<10), Split (<5), Zabok (<5), and in Novigrad (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1729 in source Catholic Church Parish Records.