Mrdeža families are Croats and they are mostly from Sibenik. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Split.
Prevalence
About 240 people with faimily name Mrdeža live in Croatia today, in 90 households. There were 160 of them in the middle of the past century, and their number increased by 50 percent. They are located in the most of Croatian counties, in 16 cities and 10 other places, mostly in Sibenik (90), Grebastica (25), Split (15), Perkovic (15), and in Pula (10).
Outside Croatia
Family name Mrdeža is present in four countries on two continents. The family name "Mrdeza " is used by some 60 people in the United States and small number in Canada.
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.