Origin of the Guillermo Surname
The Guillermo surname is of Unknown origin (Unknown). In the 2010 U.S. Census it ranked #9,581 with 3,393 Americans (1.15 per 100K people).
What the name meant to the first families who bore it — and how Guillermo traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Guillermo |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | Unknown |
| Language | Unknown |
| US Rank (2010) | #9,581 |
| US Count (2010) | 3,393 |
| Per 100K People | 1.15 |
| First Letter | G |
Ethnic Distribution of Guillermo
Among 3,393 Americans named Guillermo, the largest self-reported group is Hispanic (55.03%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Guillermo Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Guillermo moved up. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Guillermo family really come from?
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The Complete Story of the Guillermo Family
What you’ve read above is just the overview. Your full Guillermo Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Guillermo
- ✓ The Guillermo coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Guillermo families live today
- ✓ Notable Guillermo 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 Guillermo fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Guillermo
These surnames share similar popularity, spelling, or cultural background with Guillermo.
Other Unknown Surnames
Explore more surnames with Unknown roots. There are 162,254 surnames in our database — here are some that share the same Unknown origin as Guillermo.
Frequently Asked Questions About Guillermo
Top Surnames Starting with G
The most common American surnames that begin with the letter G, ranked by population.
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