In Croatia, Kalle families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
About 10 people with faimily name Kalle live in Croatia today, in 6 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in two Croatian cities only, in Zagreb (15) and Kutina (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1938 in source Phone Book - Zagreb 1938.