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Last name Байи (Baji , Bayi , Bailly ) , across the world, is a common cognomen. The family name Байи is habitual in Jersey, where it is quite a common surname, France, and Reunion (explore the name in all countries). In absolute terms, the name is most common in India, France, and the Democratic Republic of the Congo. Likewise, Байи is the forename as well as the last name.