In Croatia, Zago families are predominantly Croats (from the Island of Brac ), rarely Italians (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born on the Island of Brac and in Split.
Prevalence
About 20 people with faimily name Zago live in Croatia today, in five households only. There were 30 of them in the middle of the past century, and their number decreased by 50 percent. They are located in three Croatian cities only: in Supetar on the Island of Brac (10), Rijeka (<5), and in Mugeba (<5).
Outside Croatia
At least one family with this surname emigrated from Croatia to the United States. Family name Zago is present in 50 countries worldwide.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over seventy times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.