Champion or descendant of Niall
Oneil is a variant of the Irish surname O'Neill, derived from the Gaelic 'Ó Néill'. It signifies a descendant of Niall, a name traditionally associated with Niall of the Nine Hostages, a legendary High King of Ireland. The root 'Niall' is often interpreted as meaning champion or cloud.
About 7 boys were named Oneil in 2025.
US births per 5-year period, 1990–present (SSA data).
Former NFL offensive lineman
Professional soccer player
