In Croatia, Jonaš families are almost entirely Croats (from Slatina area ), very rarely Slovaks (from Banat, Vojvodina ). In the past century, relatively most of Croatian residents bearing this family name were born in Slatina area and in Orahovica. In Mačkovac in Slatina area every eighth inhabitant had the family name Jonaš.
Prevalence
About 30 people with faimily name Jonaš live in Croatia today, in 11 households. There were 10 of them in the middle of the past century, and their number tripled. They are located in 6 Croatian counties, in 7 cities and another small place , mostly in Osijek (<10), Slatina (<10), Rijeka (<5), Kutina (<5), and in Liganj in Opatija area (<5).