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Cognomen Oneal (Oneal , 奥尼尔 ) , all around the world, is a common last name. The last name Oneal is characteristic of Barbados, where it is quite a common surname, the United States, and New Zealand, where it is quite a rare surname. In absolute terms, it most frequently occurs in the United States, Indonesia, and Canada. Much less frequently, Oneal is the forename as well as the last name.