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Family name Ohara (オハラ , Ohara , 大原 ) , all over the world, is a common last name. The last name Ohara is characteristic of Guernsey, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United States. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Brazil. Very seldom, Ohara is the forename as well as the last name.