In Croatia, Seibert families are Croats (from Hrvatska Kostajnica ). In the past century, relatively most of Croatian residents bearing this family name were born in Pakrac and Slavonski Brod.
Prevalence
About 10 people with faimily name Seibert live in Croatia today, in 7 households. They are located in 7 Croatian counties and threee other places, mostly in Osijek (<5), Bjelovar (<5), Zagreb (<5), Zupanja (<5), and in Pakostane in Biograd na moru area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1926 in source Emigration Commission Zagreb.