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Family name オニール (O'Neil , O'Neal , O'Neill ) , around the globe, is a common last name. The cognomen オニール is characteristic of Ireland, where it is a common surname, Jersey, and British Virgin Islands (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Ireland. Much less frequently, オニール is the forename as well as the last name.