In Croatia, Janc families are predominantly Croats (from Osijek ), very rarely Germans (also from Osijek ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and Zagreb.
Prevalence
About 20 people with faimily name Janc live in Croatia today, in 6 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in two Croatian cities only, in Osijek (10) and Zagreb (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1927 in source Emigration Commission Zagreb.