In Croatia, Sereni families are Croats (from Dugi (Long) Island ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka.
Prevalence
About 10 people with faimily name Sereni live in Croatia today, in three households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only two Croatian places: in Kostrena Sveta Lucija in Bakr area (<10) and Sali on Dugi (Long) Island (<5).