In Croatia, Merdžo families are Croats (from Herzegovine ). In the past century, relatively most of Croatian residents bearing this family name were born in Herzegovina (Mostar area) and in Zagreb.
Prevalence
About 30 people with faimily name Merdžo live in Croatia today, in 19 households. There were 10 of them in the middle of the past century, and their number tripled. They are located and two other Croatian places, mostly in Zagreb (15), Sesvete (10), Split (10), Rijeka (<10), and in Osijek (<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.