In Croatia, Oster families are Croats (from Orahovica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Orahovica area and in Zagreb.
Prevalence
Only a few people with faimily name Oster live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number decreased significantly. They are located in two Croatian counties, two cities and another small place , mostly in Zagreb (<5), Zapresic (<5), and in Pokupsko in Glina area (<5).
