In Croatia, Trogrančić families are almost entirely Croats (from Middle Bosnia ), very rarely Russians (from Sveti Ivan Zelina ). In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Sarajevo area) and in East Herzegovina (Gacko area).
Prevalence
About 30 people with faimily name Trogrančić live in Croatia today, in 14 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in 8 Croatian counties, in 9 cities and another small place , mostly in Udbina in Obrovac area (<10), Karlovac (<5), Knin (<5), Pula (<5), and in Dubrovnik (<5).
Outside Croatia
Family name Trogrančić is present in 6 countries on two continents. The family name "Trograncic " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.