In Croatia, Siser families are Croats (from Bosnian Posavina ). In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Bosanski Brod area) and in Slavonski Brod.
Prevalence
About 10 people with faimily name Siser live in Croatia today, in 6 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in two Croatian cities only, in Slavonski Brod (10) and Zagreb (<5).