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Family name Oneill (اونيل , Oneill , 奥尼尔 ) , throughout the world, is a common cognomen. The cognomen Oneill is characteristic of Northern Europe, particularly Ireland, where it is quite a common surname, Aland Islands, and the United Kingdom (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in the United States, the United Kingdom, and Ireland. Very seldom, Oneill is the forename as well as the last name.