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Cognomen Muraoka (ムラオカ , Muraoka , Мураока ) , in the world, is quite a rare last name. The cognomen Muraoka is characteristic of Bermuda, where it is quite a rare surname, Brazil, where it is a rare surname, and the United States. Not in comparison with a country's population, the name is most common in the United States, Brazil, and Japan. More prevalently, Muraoka is the forename as well as the last name.