The surname O'Neal is usually Irish in origin. The name can be traced back to the County Tyrone region of Ireland. Variants of O'Neal include O'Neill, Neal, and Neale. The name probably is taken from an Irish king, Niall of the Nine Hostages.

People with the surname O'Neal:

• Alexander O'Neal, American musician
• Emmet O'Neal, American politician
• Jermaine O'Neal, American basketball player
• Patrice O'Neal, American comedian
• Ron O'Neal, American actor
• Rose O'Neal Greenhow, Confederate spy
• Ryan O'Neal, American actor
• Shaquille O'Neal, American basketball player
• Tatum O'Neal, American actress