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Surname Ketto (Ketto ) , across the world, is quite a rare last name. The last name Ketto is characteristic of Tanzania, where it is quite a rare surname, the Democratic Republic of the Congo, where it is a rare surname, and Finland, where it is a very rare surname. Measured by absolute frequency, it is commonest in the Democratic Republic of the Congo, Tanzania, and Thailand. Much less frequently, Ketto is the forename as well as the last name.