In Croatia, Birger families are Croats (from Opatija area ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and in Osijek area.
Prevalence
About 20 people with faimily name Birger live in Croatia today, in 7 households. There were 60 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian counties, four cities and two other places, mostly in Vukovar (<10), Josipovac (<5), Lovran in Opatija area (<5), Osijek (<5), and in Umag (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.