Origin of the Oneil Surname
The Oneil surname is of European origin (European). In the 2010 U.S. Census it ranked #1,220 with 28,949 Americans (9.81 per 100K people).
What the name meant to the first families who bore it — and how Oneil traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Oneil |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | European |
| Language | European |
| US Rank (2010) | #1,220 |
| US Count (2010) | 28,949 |
| Per 100K People | 9.81 |
| First Letter | O |
Ethnic Distribution of Oneil
Among 28,949 Americans named Oneil, the largest self-reported group is White (88.03%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Oneil Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Oneil moved down. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Oneil family really come from?
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The Complete Story of the Oneil Family
What you’ve read above is just the overview. Your full Oneil Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Oneil
- ✓ The Oneil coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Oneil families live today
- ✓ Notable Oneil 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 Oneil fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Oneil
These surnames share similar popularity, spelling, or cultural background with Oneil.
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 Oneil.
Frequently Asked Questions About Oneil
Top Surnames Starting with O
The most common American surnames that begin with the letter O, ranked by population.
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