In Croatia, Janček families are almost entirely Croats (from Djurdjevac area ), very rarely Czechs (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac area and in Daruvar area.
Prevalence
About 40 people with faimily name Janček live in Croatia today, in 17 households. There were 40 of them in the middle of the past century, and their number remains constant. They are located in 7 Croatian counties, in 6 cities and threee other places, mostly in Mala Cresnjevica in Djurdjevac area (10), Zagreb (<10), Pozega (<10), Dezanovac in Daruvar area (<10), and in Daruvar (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.