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Family name Otomo (オオトモ , Otomo ) , across the world, is quite a rare last name. The cognomen Otomo is characteristic of Cameroon, where it is quite a rare surname, Japan, where it is a rare surname, and Estonia. Measured by absolute frequency, it most frequently occurs in Cameroon, Japan, and Indonesia. More frequently, Otomo is the forename as well as the last name.