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Worldwide, ביי (Bay , Bey , Bye ) is a common epicene given name. The first name ביי is characteristic of Tunisia, where it is quite a rare epicene name, Mongolia, and Macao, where it is quite a rare girly name. Not in comparison with a country's population, this name is the most popular in Indonesia, Pakistan, and Algeria. More frequently, ביי is the last name as well as the forename.
ביי is also a name for the fictitious and mythical characters: Bay Ganyo , the fictional character.