Trepšić families are Croats and they are mostly from Slavonski Brod area. In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod area and in Slavonski Brod. In Prnjavor in Slavonski Brod area every sixth inhabitant had the family name Trepšić.
Prevalence
About 100 people with faimily name Trepšić live in Croatia today, in 40 households. There were 110 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 7 Croatian counties and 9 other places, mostly in Prnjavor in Slavonski Brod area (40), Zagreb (25), Osijek (10), Slavonski Brod (10), and in Struzani in Slavonski Brod area (10).
Outside Croatia
Family name Trepšić is present in this form only in Croatia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.