Cognomen Олджан (Olcan 
, Олджан 
) , in the world, is quite a rare surname. The surname Олджан is habitual in Serbia, where it is quite a rare surname, Turkey, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Turkey, Serbia, and the United States. Much less frequently, Олджан is the forename as well as the last name.