Bilen families are Croats and they are mostly from Senj. In the past century, relatively most of Croatian residents bearing this family name were born in Senj and Rijeka. In places Stinica and Jablanac in Senj every tenth inhabitant had the family name Bilen.
Prevalence
About 300 people with faimily name Bilen live in Croatia today, in 140 households. There were 280 of them in the middle of the past century, and their number increased by 10 percent. They are located in the most of Croatian counties, in 23 cities and 37 other places, mostly in Rijeka (75), Zagreb (35), Senj (15), Pozega (10), and in Klana in Opatija area (10).
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.