Merdžan families are Croats and they are mostly from Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in Herzegovina (Capljina area) and in Zagreb. In Bivolje Brdo in Herzegovina every sixth inhabitant had the family name Merdžan.
Prevalence
About 90 people with faimily name Merdžan live in Croatia today, in 40 households. There were 40 of them in the middle of the past century, and their number doubled. They are located in 10 Croatian counties, in 15 cities and 6 other places, mostly in Zagreb (20), Metkovic (15), Dubrovnik (10), Gradiste in Zupanja area (<10), and in Ploce (<10).
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.