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Surname Oneil (Oneil , オニール , 奥尼尔 ) , across the world, is a common last name. The cognomen Oneil is habitual in Senegal, where it is quite a rare surname, the United States, and Trinidad and Tobago. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Senegal. Very seldom, Oneil is the forename as well as the last name.