In Croatia, Bielen families are Croats (from Zlatar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zlatar area.
Prevalence
About 20 people with faimily name Bielen live in Croatia today, in 9 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in only four naselja i to in Zagreb (20), Sesvete (<10), Karlovac (<5), and in Sveti Petar u Sumi in Pazin area (<5).
Outside Croatia
Family name Bielen is present in 15 countries worldwide. The family name "Bielen " is used by some 1000 people in Poland , about 1000 in Belgium , and some 800 people in the United States.
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.