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Surname Adero (Adero ) , all around the world, is quite a rare last name. The family name Adero is characteristic of Sub-Saharan Africa, particularly Kenya, where it is quite a rare surname, Uganda, where it is a rare surname, and Tanzania. Measured by absolute frequency, it is the most numerous in Sub-Saharan Africa, particularly Kenya, Uganda, and Nigeria. Likewise, Adero is the forename as well as the last name.