Origin of the Ocallaghan Surname
The Ocallaghan surname is of European origin (European). In the 2010 U.S. Census it ranked #10,626 with 3,014 Americans (1.02 per 100K people).
What the name meant to the first families who bore it — and how Ocallaghan traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Ocallaghan |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | European |
| Language | European |
| US Rank (2010) | #10,626 |
| US Count (2010) | 3,014 |
| Per 100K People | 1.02 |
| First Letter | O |
Ethnic Distribution of Ocallaghan
Among 3,014 Americans named Ocallaghan, the largest self-reported group is White (95.49%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Ocallaghan Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Ocallaghan moved down. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Ocallaghan family really come from?
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The Complete Story of the Ocallaghan Family
What you’ve read above is just the overview. Your full Ocallaghan Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Ocallaghan
- ✓ The Ocallaghan coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Ocallaghan families live today
- ✓ Notable Ocallaghan 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 Ocallaghan fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Ocallaghan
These surnames share similar popularity, spelling, or cultural background with Ocallaghan.
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 Ocallaghan.
Frequently Asked Questions About Ocallaghan
Top Surnames Starting with O
The most common American surnames that begin with the letter O, ranked by population.
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