In Croatia, Siber families are almost entirely Croats (from Osijek ), very rarely Russians (from Split ). In the past century, relatively most of Croatian residents bearing this family name were born in Split and Osijek.
Prevalence
About 30 people with faimily name Siber live in Croatia today, in 7 households. There were 40 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 6 Croatian counties and two other places, mostly in Split (20), Osijek (10), Sisak (<5), Zagreb (<5), and in Zapresic (<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.