List of Famous people with last name O-neill

Tirlough Brassileagh O'Neill was the son of Phelim Caoch O'Neill, a prince of the Cenél nEógain.

Hugh McShane O'Neill was an early modern Irish nobleman and rebel. Genealogies list Hugh as either the youngest son of Con MacShane O'Neill, or 3rd son of Shane O'Neill himself. In either case he was a grandson of Conn O'Neill, 1st Earl of Tyrone, and Gearoid Mór Fitzgerald, 8th Earl of Kildare, and of the primary line of the O'Neill of Tyrone clan. Shane was the Prince of Ulster and Chief of all the O'Neill septs until his death in 1567. Hugh gained his patrimony, like his father, from the O'Neill sept clan he'd been fostered by; the McShanes of Killetragh and the Glenconkeyne forest. This group was also called the "Wild Clan Shanes of Killetragh" or the "McShane-O'Neills".

Hugh Oge O'Neill, known fully as Hugh Oge McHugh O'Neill, was the son of Hugh O'Neill of the Clandeboye O'Neill's of eastern Ulster, Gaelic Ireland.