In Croatia, Trtan families are generally Croats (from Opatija area ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Beli Manastir area and in Zagreb.
Prevalence
About 20 people with faimily name Trtan live in Croatia today, in five households only. They are located in only four naselja i to in Rijeka (<10), Zagreb (<10), Pasjak in Opatija area (<5), and in Turopolje (<5).