Where does “O'Neill” come from?

O'Neill (English) comes from Irish Niall, from Old Irish Níall.

Ancestry of “O'Neill”, step by step

StepLanguageWordMeaning
1IrishNiall—
2Old IrishNíall—

Words derived from “O'Neill”

Every word from Old Irish Níall →Every word from Irish Niall →
O'Neill — Etymology, Origin & Word History | Etymology Explorer