Trošt families are Croats and they are mostly from Pula. According to some sources they originate from Czechia. In the past century, relatively most of Croatian residents bearing this family name were born in Pula and in Labin area.
Prevalence
About 80 people with faimily name Trošt live in Croatia today, in 40 households. There were 60 of them in the middle of the past century, and their number increased by 40 percent. They are located in threee Croatian counties and 12 other places, mostly in Rovinj (15), Sorici in Rovinj area (10), Pula (<10), Pazin (<10), and in Prhati in Labin area (<10).
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.