Cognomen Dareios (دارا 
, داریوش 
, Dareios 
) , all around the world, is quite a rare last name. The cognomen Dareios is characteristic of Iran, where it is quite a rare surname, Iraq, and Israel, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Iran, Iraq, and Syria. More prevalently, Dareios is the forename as well as the last name.