In Croatia, Deker families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak.
Prevalence
Only a few people with faimily name Deker live in Croatia today, in five households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in only threee naselja i to in Sisak (<5), Zagreb (<5), and in Staro Pracno (<5).