In Croatia, Mardjetko families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
Only a few people with faimily name Mardjetko live in Croatia today, in two households only. They are located in two Croatian cities only, in Zagreb (<5) and Koprivnica (<5).
Outside Croatia
Family name Mardjetko is present in 6 countries on three continents. The family name "Mardjetko " is used by small number of people in Australia and small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.