In Croatia, Suplina families are Croats (from Buzet area ). In the past century, relatively most of Croatian residents bearing this family name were born in Buzet area and in Opatija.
Prevalence
About 20 people with faimily name Suplina live in Croatia today, in 7 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Boljun in Buzet area (<10), Opatija (<5), Poljane (<5), and in Rijeka (<5).