Cognomen Эрджан (Ercan 
, Erdjan 
, Erdzhan 
) , worldwide, is a common family name. The last name Эрджан is habitual in Turkey, where it is quite a common surname, North Macedonia, and Bulgaria, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Turkey, Germany, and North Macedonia. Likewise, Эрджан is the forename as well as the last name.