In Croatia, Tarnaj families are almost entirely Croats (from Djakovo area ), very rarely Hungarians (also from Djakovo area ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo and in Djakovo area.
Prevalence
About 30 people with faimily name Tarnaj live in Croatia today, in 10 households. There were 20 of them in the middle of the past century, and their number increased by 30 percent. They are located in two Croatian counties, threee cities and another small place , mostly in Satnica Djakovacka in Djakovo area (20), Zagreb (<5), Osijek (<5), and in Djakovo (<5).