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In the entire world, Duo (Du
, Duo
, Duel
) is a common unisex given name. The forename Duo is habitual in Macao, where it is quite a rare girly name, Mongolia, where it is quite a rare boy's name, and Vietnam, where it is quite a rare predominantly male, but very infrequently female name. Not in comparison with a country's population, it is the most numerous in India, Vietnam, and China. Much more prevalently, Duo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Du, Duo | Myanmar, India, Vietnam, United States, China |
| Duel | Myanmar, India, France, Indonesia, United States |
| До | Kazakhstan, Russia, Belarus, Azerbaijan, Ukraine |
Duo is also a name for the fictitious and mythical characters: Duo Maxwell , the fictional character from Mobile Suit Gundam Wing; Duo Lon , the fictional character from The King of Fighters, The King of Fighters XIII; Du Bois , the character in the play "The Misanthrope" and Du Croc , the fictional character appearing in the movie « Marie Reine d'Écosse », Mary, Queen of Scots.