In Croatia, Decker families are Croats (from Slavonski Brod area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
About 20 people with faimily name Decker live in Croatia today, in 8 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in only four naselja i to in Zagreb (15), Svilaj in Slavonski Brod area (<5), Split (<5), and in Rijeka (<5).