In Croatia, Frolja families are Croats (from Opatija area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Opatija area.
Prevalence
About 20 people with faimily name Frolja live in Croatia today, in 6 households. There were 30 of them in the middle of the past century, and their number decreased by 20 percent. They are only located in two Croatian cities and four other places, mostly in Moscenicka Draga (10), Lovran (<5) and Martina (<5) in Opatija area, Rijeka (<5), and in Icici (<5).