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Surname Iroha (Iroha ) , across the world, is quite a rare family name. The last name Iroha is habitual in Nigeria, where it is quite a rare surname, the United Kingdom, where it is a very rare surname, and the United States. Measured by absolute frequency, it is the most numerous in Nigeria, the United States, and Indonesia. Likewise, Iroha is the forename as well as the last name.