There are already 1,075 users and over 21,711 genealogy profiles with the O'Neill surname on Geni. Explore O'Neill genealogy and family history in the World's Largest Family Tree.
Áed mac Diarmato (died 604), called Áed Sláine (Áed of Slane), was the son of Diarmait mac Cerbaill. Legendary stories exist of Áed's birth. Saint Columba is said to have prophesied his death. His desc...
mic (had a brother from whom descend the O'Neills)Called Hugh the Dextrous; he was killed in battleAodh Athlamh(The last King of his line.)Migration BET 1030 AND 1047 Settled on Barra in the HebridesTh...
Niall of the Nine Hostages son changed his last name to O'Neill
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