In Croatia, Žmiko families are Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Knin area.
Prevalence
About 20 people with faimily name Žmiko live in Croatia today, in 12 households. There were 40 of them in the middle of the past century, and their number halved. They are located in only threee Croatian places: in Uzdolje in Knin area (15), Knin (<5), and in Siveric (<5).
Outside Croatia
At least three families with this surname emigrated from Croatia to the United States (2) and Germany (1). Family name Žmiko (including: Zmiko , Zmieko ) is present in three countries on two continents. "Zmieko " is used by few people in the United States.