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Throughout the world, ディア (Dyah , Dia , Dear ) is a widespread dominantly feminine, but uncommonly male given name. The first name ディア is characteristic of Indonesia, where it is quite a common predominantly girly, but very seldom masculine name, Gabon, where it is quite a common male name, and Senegal, where it is quite a common predominantly masculine, but very seldom girly name. Not in comparison with a country's population, this name is the most popular in Indonesia, Senegal, and Algeria. Likewise, ディア is the last name as well as the forename.
ディア is also a name for the fictitious and mythical characters: Dia Kurosawa , the fictional character from Love Live! Sunshine!!; Zia Rashid , character in The Kane Chronicles; Dia , the mythological Greek character; Dia and Dear Daniel , the fictional character.