In Croatia, Terzin families are generally Croats (from Zadar ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and Zagreb.
Prevalence
About 30 people with faimily name Terzin live in Croatia today, in 14 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in 6 Croatian counties, in 7 cities and threee other places, mostly in Zagreb (15), Osijek (<5), Zadar (<5), Slavonski Brod (<5), and in Split (<5).
Outside Croatia
Family name Terzin is present in 9 countries on three continents. The family name "Terzin " is used by small number of people in the United States and small number in Spain.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1929 in source Emigration Commission Zagreb.