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Last name オハラ (オハラ , Ohara , O'Hara ) , in the entire world, is a common surname. The surname オハラ is habitual in Ireland, where it is quite a common surname, Guernsey, and Australia. Not in comparison with a country's population, it most frequently occurs in the United States, the United Kingdom, and Australia. Much less frequently, オハラ is the forename as well as the last name.