Trtica families are mainly Serbs and they are mostly from Otocac area , whereas often Croats. In the past century, relatively most of Croatian residents bearing this family name were born in Otocac area and in Gospic. In Gornje Vrhovine in Otocac area every eighth inhabitant had the family name Trtica.
Prevalence
About 80 people with faimily name Trtica live in Croatia today, in 40 households. There were 150 of them in the middle of the past century, and their number halved. They are located in 9 Croatian counties, in 13 cities and 13 other places, mostly in Zagreb (10), Gospic (<10), in Vrhovine (<10) and Gornje Vrhovine (<10) in Otocac area, and in Slavonski Brod (<10).
Outside Croatia
At least five families with this surname emigrated from Croatia to: Sweden (2), the United States (1), Australia (1), and to France (1). Family name Trtica is present in 9 countries on four continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1933 in source Emigration Commission Zagreb.