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Cognomen Ohya (Ohya , Ооя) , around the globe, is a rare family name. The cognomen Ohya is characteristic of Philippines, where it is a rare surname, Morocco, where it is a very rare surname, and Japan. Not in comparison with a country's population, the name is most common in Philippines, Brazil, and Japan. Very seldom, Ohya is the forename as well as the last name.