Hajek families are often Croats and they are mostly from Cazma area , rarely Czechs. In the past century, relatively most of Croatian residents bearing this family name were born in Kutina and in Cazma area.
Prevalence
About 80 people with faimily name Hajek live in Croatia today, in 30 households. There were 100 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 10 Croatian counties, in 9 cities and 7 other places, mostly in Zagreb (15), Split (<10), Pozega (<10), Nasice (<10), and in Popovaca in Kutina area (<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.