Kadlec families are often Croats and they are mostly from Virovitica , less frequently Czechs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Daruvar area.
Prevalence
About 70 people with faimily name Kadlec live in Croatia today, in 30 households. There were 90 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 13 cities and 12 other places, mostly in Virovitica (<10), Sesvete (<10), Daruvar (<10), Gornja Reka (<10), and in Zagreb (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.