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ONEIL
Surname of Irish origin. It is derived from the Gaelic Ó Néill meaning "descendant of Niall". The Uí Néill dynasty were the foremost dynasty of Ulster, and all Ireland, from the 5th century throughout the medieval period, until 1607 - the Flight of the Earls saw the end of Gaelic Ireland. O'Neill is one of the most common Irish surnames.