Trbuščić families are Croats and they are mostly from Duga Resa. According to some sources they are from Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Duga Resa. In Lišnica in Duga Resa every fourth inhabitant had the family name Trbuščić.
Prevalence
About 90 people with faimily name Trbuščić live in Croatia today, in 30 households. They are located in threee Croatian counties and four other places, mostly in Lisnica (55), Duga Resa (20), Karlovac (15), Skupica in Duga Resa area (<10), and in Velika Gorica (<5).
Outside Croatia
Family name Trbuščić is present in two countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.