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Last name Omena (Omena ) , worldwide, is quite a common cognomen. The last name Omena is characteristic of Brazil, where it is quite a rare surname, Papua New Guinea, and the Democratic Republic of the Congo, where it is a rare surname. In absolute terms, it is the most numerous in Brazil, Nigeria, and the Democratic Republic of the Congo. Much less frequently, Omena is the forename as well as the last name.