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Across the world, O'Neil (O'Neil , オニール , אוניל ) is a rare principally masculine, but scarcely female forename. The first name O'Neil is habitual in Jamaica, where it is quite a rare male name, the Dominican Republic, where it is a rare masculine name, and South Africa, where it is a very rare masculine name. Measured by absolute frequency, this name is the most popular in Jamaica, South Africa, and Philippines. More frequently, O'Neil is the last name as well as the forename.
O'Neil is also a name for the fictitious and mythical characters: .