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Across the world, ダイ (Dai , ダイ , Dye ) is a common unisex first name. The given name ダイ is habitual in Mongolia, where it is quite a common gender-neutral name, Macao, and Vietnam, where it is quite a rare predominantly masculine, but very seldom girly name. Not in comparison with a country's population, this name is the most popular in India, Vietnam, and Indonesia. Much more frequently, ダイ is the last name as well as the forename.
ダイ is also a name for the fictitious and mythical characters: Dai , the fictional character from Dragon Quest: Dai no Daibōken, Dragon Quest: The Adventure of Dai and Dai Donovan , the fictional character from Pride.