O'neill
BoyIrish
O'neill is a boy name of Irish origin meaning "descendant of Niall".
About this name
Gender
Boy
Language
Irish
Religion
Christian
Syllables
2
Length
7 letters
Meaning
descendant of Niall
Etymology
From Gaelic Ó Néill, meaning 'grandson of Niall' or 'descendant of Niall', where Niall is an old Irish name meaning 'champion' or 'cloud'
Frequently Asked Questions About O'neill
What does the name O'neill mean?
O'neill means "descendant of Niall", and is of Irish origin.
What is the origin of the name O'neill?
O'neill originates from Irish, commonly used in Ireland.
Is O'neill a boy or girl name?
O'neill is typically used as a boy name.
What religion is the name O'neill associated with?
O'neill is associated with Christian.
Last updated: June 2026