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Family name Otieno (Otieno ) , in the entire world, is a widespread last name. The surname Otieno is characteristic of Sub-Saharan Africa, particularly Kenya, where it is a common surname, Seychelles, where it is quite a common surname, and Tanzania, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Sub-Saharan Africa, particularly Kenya, Tanzania, and Uganda. Much less frequently, Otieno is the forename as well as the last name.