Čajo families are Croats and they are mostly from Drnis area. In the past century, relatively most of Croatian residents bearing this family name were born in Split and in Drnis area.
Prevalence
About 80 people with faimily name Čajo live in Croatia today, in 30 households. There were 30 of them in the middle of the past century, and their number more than doubled. They are located in 9 Croatian counties, in 10 cities and 10 other places, mostly in Osijek (25), Split (20), Zagreb (15), Kastel Luksic (<10), and in Pula (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.