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Last name Iwashina (岩科 , Iwashina , Ивасина ) , in the world, is a very rare cognomen. The cognomen Iwashina is characteristic of Israel, where it is a very rare surname, Canada, and Russia. Measured by absolute frequency, it is the most numerous in China, Russia, and the United States. Likewise, Iwashina is the forename as well as the last name.