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Throughout the world, Oneill (اونيل , Oneill , 奥尼尔 ) is a rare largely masculine, but uncommonly female first name. The given name Oneill is habitual in the Dominican Republic, where it is a rare masculine name, the United Kingdom, where it is a very rare gender-neutral name, and Nigeria. In absolute terms, it is the most numerous in the United States, Nigeria, and the United Kingdom. Much more prevalently, Oneill is the last name as well as the forename.
Oneill is also a name for the fictitious and mythical characters: .