In Croatia, Dajko families are mainly Rusyns (from Ilok area ), rarely Croats (from Vukovar ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Ilok area and in Vukovar.
Prevalence
About 10 people with faimily name Dajko live in Croatia today, in three households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Vukovar (<10) and Miklusevci in Ilok area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1927 in source Emigration Commission Zagreb.