In Croatia, Zetin families are Croats (from Sisak area ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and in Sisak area.
Prevalence
About 20 people with faimily name Zetin live in Croatia today, in 12 households. There were 60 of them in the middle of the past century, and their number decreased significantly. They are located in threee Croatian counties, threee cities and four other places, mostly in Setus in Sisak area (20), Sisak (<10), Ivanic-Grad (<5), Cakovec (<5), and in Hrastelnica (<5).
Outside Croatia
Family name Zetin (including: Zetien , Zettin and Zethrin ) is present in 9 countries worldwide. The family name "Zetin " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.