In Croatia, Sardelin families are generally Croats (from Rovinj area ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Pula.
Prevalence
About 10 people with faimily name Sardelin 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 only located in in one Croatian city and two other places, mostly in Funtana (<10) and Vrsar (<5) in Rovinj area, and in Porec (<5).
Outside Croatia
Family name Sardelin is present in this form only in Croatia.
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.