In Croatia, Hašek families are almost entirely Croats (from Virovitica area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Virovitica area and in Pakrac. In Trnava Cabunska in Virovitica area every twentieth inhabitant had the family name Hašek.
Prevalence
About 40 people with faimily name Hašek live in Croatia today, in 16 households. There were 30 of them in the middle of the past century, and their number increased by 10 percent. They are only located in in 7 Croatian cities and 5 other places, mostly in Daruvar (<10), Zagreb (<10), Rezovac (<10), Praputnjak (<10), and in Virovitica (<5).
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.