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Last name Karimou (Karimou ) , all around the world, is quite a common surname. The last name Karimou is characteristic of Sub-Saharan Africa, particularly Benin, where it is quite a rare surname, Niger, and Cameroon. Not in comparison with a country's population, this name is the most popular in Niger, Algeria, and Benin. Likewise, Karimou is the forename as well as the last name.