In Croatia, Šergo families are generally Croats (from Porec ), very rarely Italians (also from Porec ), and barely Slovenes. In the past century, relatively most of Croatian residents bearing this family name were born in Porec and Osijek. In Žbandaj in Porec every seventh inhabitant had the family name Šergo.
Prevalence
About 60 people with faimily name Šergo live in Croatia today, in 20 households. There were 60 of them in the middle of the past century, and their number remains constant. They are located in threee Croatian counties and 7 other places, mostly in Visnjevac (15), Porec (10), Rijeka (<10), Vrsar in Rovinj area (<10), and in Tenja (<5).
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.