In Croatia, Trnačić families are almost entirely Croats (from Pozega area ), very rarely Bosniaks (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Pozega area and in Pozega. In Stara Kapela in Pozega area every fourth inhabitant had the family name Trnačić.
Prevalence
About 30 people with faimily name Trnačić live in Croatia today, in 10 households. There were 50 of them in the middle of the past century, and their number decreased by 40 percent. They are located in threee Croatian counties, threee cities and four other places, mostly in Bzenica (15), Rijeka (<10), Pozega (<10), and in Dragovci (<10) and Velika (<5) in Pozega area.
Outside Croatia
Family name Trnačić is present in this form only in Croatia.