In Croatia, Stefanko families are Croats (from Vukovar ). In the past century, relatively most of Croatian residents bearing this family name were born in Vukovar.
Prevalence
Only a few people with faimily name Stefanko live in Croatia today, in two households only. They are located in one Croatian city only, in Vukovar (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.