Guillermo
How to say it: gee-YER-moh · /ɡiˈjɛrmoʊ/
Spanish form of William; from Germanic 'Wilhelm' meaning resolute protector (wil = will, helm = helmet/protection).
Guillermo was the 830th most popular boys’ name in the United States in 2025, given to 264 babies (Social Security Administration). Its busiest decade was the 1990s, its births are down about 32% in ten years, and it is projected to slip to #874 by 2030.
Updated · SSA 2025 data, published May 2026 · How we compute these figures
Key facts
| Rank among boys’ names, 2025 | #830 |
|---|---|
| Babies born in 2025 | 264 |
| Share of births | 1 in 12,558 |
| Peak decade | 1990s |
| Change over 10 years | −32% |
| Projected rank for 2030 (estimate) | #874 |
Sources: Social Security Administration (SSA). How we compute these figures.
Its life, decade by decade
Popularity crested in the 1990s for Guillermo, which now sits well below that high while staying in regular use. The next few years should see it ease down a bit more.
What goes with it
Rolling and resonant with soft flowing sounds, Guillermo feels strong and travels well. Diego and Rafael share its style.
Parents who love Guillermo also love
Nicknames
- Guille
- Memo
- Willy
Honouring a Guillermo in the family
- Willypet form
- Williamequivalent
- Vilhelmequivalent
- Willemequivalent
- Willequivalent
- Guillaumeequivalent
In the classroom
In a class of 25 children born in 2025, the chance that another child is called Guillermo is about under 1 in 200.
Around the world
This spelling is used in English, French, German, Spanish.
Famous people named Guillermo
- Guillermo Lasso (born 1955)55th President of Ecuador from 2021 to 2023
- Guillermo del Toro (born 1964)Mexican filmmaker and author
- Guillermo Ochoa (born 1985)Mexican association football player
From Wikidata and Wikipedia
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