Origin of the Osullivan Surname
The Osullivan surname is of European origin (European). In the 2010 U.S. Census it ranked #3,032 with 11,818 Americans (4.01 per 100K people).
What the name meant to the first families who bore it — and how Osullivan traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Osullivan |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | European |
| Language | European |
| US Rank (2010) | #3,032 |
| US Count (2010) | 11,818 |
| Per 100K People | 4.01 |
| First Letter | O |
Ethnic Distribution of Osullivan
Among 11,818 Americans named Osullivan, the largest self-reported group is White (93.83%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Osullivan Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Osullivan moved up. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Osullivan family really come from?
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The Complete Story of the Osullivan Family
What you’ve read above is just the overview. Your full Osullivan Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Osullivan
- ✓ The Osullivan coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Osullivan families live today
- ✓ Notable Osullivan 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 Osullivan fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Osullivan
These surnames share similar popularity, spelling, or cultural background with Osullivan.
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 Osullivan.
Frequently Asked Questions About Osullivan
Top Surnames Starting with O
The most common American surnames that begin with the letter O, ranked by population.
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