Troha families are Croats and they are mostly from Delnice area. According to some sources they originate from Austria. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Cabar. In Stara Sušica in Delnice area every fifth inhabitant had the family name Troha.
Prevalence
About 480 people with faimily name Troha live in Croatia today, in 220 households. There were 500 of them in the middle of the past century, and their number remains constant. They are located in the most of Croatian counties, in 40 cities and 48 other places, mostly in Zagreb (75), Rijeka (30), Stara Susica in Delnice area (25), Prezid (25), and in Orahovica (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.