Origin of the Oneill Surname
The Oneill surname is of European origin (European). In the 2010 U.S. Census it ranked #689 with 50,028 Americans (16.96 per 100K people).
What the name meant to the first families who bore it — and how Oneill traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Oneill |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | European |
| Language | European |
| US Rank (2010) | #689 |
| US Count (2010) | 50,028 |
| Per 100K People | 16.96 |
| First Letter | O |
Ethnic Distribution of Oneill
Among 50,028 Americans named Oneill, the largest self-reported group is White (92.67%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Oneill Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Oneill moved down. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Oneill family really come from?
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The Complete Story of the Oneill Family
What you’ve read above is just the overview. Your full Oneill Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Oneill
- ✓ The Oneill coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Oneill families live today
- ✓ Notable Oneill bearers in history
- ✓ Name variations & spellings worldwide
- ✓ A step-by-step guide to start tracing your own family tree
🎁 A heritage keepsake to pass down — perfect as a gift.
Get one Oneill fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Oneill
These surnames share similar popularity, spelling, or cultural background with Oneill.
Other European Surnames
Explore more surnames with European roots. There are 162,254 surnames in our database — here are some that share the same European origin as Oneill.
Frequently Asked Questions About Oneill
Top Surnames Starting with O
The most common American surnames that begin with the letter O, ranked by population.
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