Family name אוניל (O'Neil 
, O'Neal , O'Neill ) , all around the world, is a common cognomen. The surname אוניל is habitual in Ireland, where it is a common surname, Jersey, and British Virgin Islands (explore the name in all countries). In absolute terms, the name is most common in the United States, the United Kingdom, and Ireland. Very seldom, אוניל is the forename as well as the last name.