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Surname Karimu (Karimu ) , across the world, is a common cognomen. The last name Karimu is habitual in Sub-Saharan Africa, particularly Ghana, where it is quite a rare surname, Sierra Leone, and Nigeria. Not in comparison with a country's population, it is the most numerous in Sub-Saharan Africa, particularly Nigeria, Tanzania, and Ghana. Likewise, Karimu is the forename as well as the last name.