In Croatia, Čadek families are Croats (from Valpovo area ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and in Valpovo area.
Prevalence
About 20 people with faimily name Čadek live in Croatia today, in 9 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in four Croatian counties, four cities and two other places, mostly in Bizovac in Valpovo area (<10), Osijek (<5), Krizevci (<5), Gacelezi (<5), and in Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1938 in source Phone Book - Zagreb 1938.