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Last name Ababu (Ababu , ابابو) , all around the world, is a common cognomen. The cognomen Ababu is habitual in Ethiopia, where it is quite a common surname, Kenya, where it is a rare surname, and Lebanon. In absolute terms, this name is the most popular in Ethiopia, Kenya, and Saudi Arabia. Much less frequently, Ababu is the forename as well as the last name.