In Croatia, Jonke families are almost entirely Croats (from Ivanec area ), barely Montenegrins (from Samobor ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Ivanec area.
Prevalence
About 50 people with faimily name Jonke live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number remains constant. They are located in 7 Croatian counties, four cities and 5 other places, mostly in Zagreb (35), Plemenscina in Ivanec area (<10), Rijeka (<10), Samobor (<10), and in Rovinj (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.