Origin of the Dennehy Surname
The Dennehy surname is of French/Spanish origin (French). In the 2010 U.S. Census it ranked #16,544 with 1,735 Americans (0.59 per 100K people).
What the name meant to the first families who bore it — and how Dennehy traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Dennehy |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | French/Spanish |
| Language | French |
| US Rank (2010) | #16,544 |
| US Count (2010) | 1,735 |
| Per 100K People | 0.59 |
| First Letter | D |
Ethnic Distribution of Dennehy
Among 1,735 Americans named Dennehy, the largest self-reported group is White (95.27%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Dennehy Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Dennehy moved down. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Dennehy family really come from?
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The Complete Story of the Dennehy Family
What you’ve read above is just the overview. Your full Dennehy Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Dennehy
- ✓ The Dennehy coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Dennehy families live today
- ✓ Notable Dennehy 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 Dennehy fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Dennehy
These surnames share similar popularity, spelling, or cultural background with Dennehy.
Other French/Spanish Surnames
Explore more surnames with French/Spanish roots. There are 162,254 surnames in our database — here are some that share the same French/Spanish origin as Dennehy.
Frequently Asked Questions About Dennehy
Top Surnames Starting with D
The most common American surnames that begin with the letter D, ranked by population.
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