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Last name Adja (Adja , Dja ) , all around the world, is a common surname. The family name Adja is characteristic of Ivory Coast, where it is quite a common surname, Algeria, and Guinea-Bissau, where it is quite a rare surname. In absolute terms, the name is most common in Indonesia, Algeria, and Ivory Coast. Also, Adja is the forename as well as the last name.