Demo families are Croats and they are mostly from Zadar area. In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and in Zadar area.
Prevalence
About 240 people with faimily name Demo live in Croatia today, in 100 households. There were 160 of them in the middle of the past century, and their number increased by 50 percent. They are located in the most of Croatian counties, in 17 cities and 20 other places, mostly in Rijeka (55), Zagreb (30), Zadar (30), Policnik in Zadar area (20), and in Donje Rastane in Biograd na moru area (15).
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.