Mrđa families are predominantly Serbs and they are mostly from Cazinska Krajina Region (Bosnia), but often Croats. In the past century, relatively most of Croatian residents bearing this family name were born in Cazins Region, Bosnia (Bosanski Petrovac area) and in Osijek. In places Smoljana and Krnja Jela in Cazins Region (Bosnia) every third inhabitant had the family name Mrđa.
Prevalence
About 170 people with faimily name Mrđa live in Croatia today, in 90 households. There were 180 of them in the middle of the past century, and their number decreased by 0 percent. They are located in the most of Croatian counties, in 15 cities and 12 other places, mostly in Zagreb (45), Beli Manastir (40), Bolman in Beli Manastir area (35), and in Birovaca (20) and Donji Lapac (15) in Obrovac area.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.