In Croatia, Opalin families are Croats (from Klanjec ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Klanjec.
Prevalence
About 10 people with faimily name Opalin live in Croatia today, in five households only. There were 20 of them in the middle of the past century, and their number halved. They are located in only two naselja i to in Zagreb (10) and Ivanja Reka (<5).
Outside Croatia
Family name Opalin is present in 9 countries worldwide. "Opalien " is used by few people in the United States.