Cognomen Dilian (Dilian 
, Дилян 
, דיליאן 
) , across the world, is a rare last name. The cognomen Dilian is habitual in Honduras, where it is quite a rare surname, Israel, where it is a rare surname, and Nicaragua. Measured by absolute frequency, this name is the most popular in Honduras, Mexico, and Indonesia. More frequently, Dilian is the forename as well as the last name.