In Croatia, Tonjac families are almost entirely Croats (from Glina area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Glina area and in Zagreb.
Prevalence
About 30 people with faimily name Tonjac live in Croatia today, in 10 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties, threee cities and four other places, mostly in Velika Vranovina in Glina area (10), Petrinja (<10), Zagreb (<10), Sesvete (<5), and in Karlovac (<5).