What is the meaning of the word "o'neill"?

The O'Neill name has been borne by many notable figures in various fields, from politics and military to arts and sports, continuing to leave a mark on Irish and global heritage.

Definitions:

Irish surname meaning descendant of 'Niall', believed to mean 'champion' or 'cloud'. NOUN
- The legacy of the O'Neill family is celebrated in Irish history and culture, symbolizing the enduring spirit of the Irish people.