In Croatia, Častek families are mainly Croats (from Garesnica area ), rarely Czechs (from Daruvar ), and barely Hungarians (from Daruvar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Pakrac and Daruvar.
Prevalence
About 50 people with faimily name Častek live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 6 Croatian counties, in 6 cities and 12 other places, mostly in Daruvar (15), Zagreb (10), Sukosan in Zadar area (<10), Hercegovac in Garesnica area (<10), and in Grubisno Polje (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.