Origin of the Oreilly Surname
The Oreilly surname is of European origin (European). In the 2010 U.S. Census it ranked #2,970 with 12,074 Americans (4.09 per 100K people).
What the name meant to the first families who bore it — and how Oreilly traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Oreilly |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | European |
| Language | European |
| US Rank (2010) | #2,970 |
| US Count (2010) | 12,074 |
| Per 100K People | 4.09 |
| First Letter | O |
Ethnic Distribution of Oreilly
Among 12,074 Americans named Oreilly, the largest self-reported group is White (91.86%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Oreilly Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Oreilly moved down. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Oreilly family really come from?
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The Complete Story of the Oreilly Family
What you’ve read above is just the overview. Your full Oreilly Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Oreilly
- ✓ The Oreilly coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Oreilly families live today
- ✓ Notable Oreilly 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 Oreilly fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Oreilly
These surnames share similar popularity, spelling, or cultural background with Oreilly.
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 Oreilly.
Frequently Asked Questions About Oreilly
Top Surnames Starting with O
The most common American surnames that begin with the letter O, ranked by population.
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