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Cognomen Ooka (Ooka , Оока) , all around the world, is quite a rare last name. The surname Ooka is habitual in Guam, where it is quite a common surname, Egypt, where it is a rare surname, and South Africa, where it is a very rare surname. In absolute terms, it is commonest in Egypt, the United States, and Guam. Likewise, Ooka is the forename as well as the last name.