In Croatia, Hajko families are Croats (from Ozalj ). In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Ozalj.
Prevalence
About 20 people with faimily name Hajko live in Croatia today, in five households only. There were 30 of them in the middle of the past century, and their number decreased by 30 percent. They are located in only two naselja i to in Ozalj (10) and Novaki Ozaljski (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.