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Cognomen Bayi (Bayi , バイ , Байи ) , in the entire world, is a common family name. The last name Bayi is characteristic of Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is quite a common surname, Cameroon, where it is quite a rare surname, and Botswana. In absolute terms, it is the most numerous in India, the Democratic Republic of the Congo, and Cameroon. Much less frequently, Bayi is the forename as well as the last name.