Čajko families are Croats and they are mostly from Donja Stubica. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Donja Stubica.
Prevalence
About 190 people with faimily name Čajko live in Croatia today, in 70 households. There were 200 of them in the middle of the past century, and their number remains constant. They are located in 7 Croatian counties, in 12 cities and 15 other places, mostly in Zagreb (65), Bedekovcina in Lepoglava area (30), Lepa Ves (15), Matenci (15), and in Donja Stubica (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.