In Croatia, Janč families are Croats (from Slavonski Brod ). In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod.
Prevalence
Only a few people with faimily name Janč live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number halved. They are located in one Croatian city only, in Slavonski Brod (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.