In Croatia, Tropper families are Croats (from Opatija ). In the past century, relatively most of Croatian residents bearing this family name were born in Opatija.
Prevalence
About 10 people with faimily name Tropper live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in two Croatian cities only, in Opatija (<5) and Pula (<5).
Outside Croatia
Family name Tropper is present in 21 countries worldwide. The family name "Tropper " is used by some 400 people in the United States , about 400 in Austria , and some 100 people in Argentina.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.