Hajak families are Croats and they are mostly from Vrbovca. In the past century, relatively most of Croatian residents bearing this family name were born in Vrbovec and Zagreb.
Prevalence
About 60 people with faimily name Hajak live in Croatia today, in 30 households. There were 130 of them in the middle of the past century, and their number halved. They are located in threee Croatian counties, threee cities and 13 other places, mostly in Poljana (15), Zagreb (15), Topolovec (15), Vrbovec (<10), and in Lovrecka Varos (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.