Guillermo
Guillermo is a boy name of Spanish origin meaning “Resolute protector”, pronounced gee-YER-moh. It ranked #902 in the United States in 2025, given to 264 babies, and peaked at #352 in 1996. Common nicknames: Memo, Willy, Guille.
How popular is Guillermo in the United States?
Data: U.S. Social Security Administration (SSA). Based on all Social Security card applications for births in the United States.
What does Guillermo mean, and where does it come from?
Guillermo is the Spanish form of William, from the Germanic wil, "will" or "desire," and helm, "helmet" — the name the Normans took to England and the Visigoths had already taken to Spain. It has been in American birth records since 1885 and in the top thousand since 1892, one of the longest continuous runs of any Spanish name in the United States. Mexico supplies its two most visible bearers: the director Guillermo del Toro and the goalkeeper Guillermo Ochoa. Memo is the standard nickname, and nothing about it is obvious from the outside.
How is Guillermo used around the world?
Guillermo is used in 1 languages worldwide, with 12+ international variants.
Female FormGuillermina
Linguistic data: Wikidata (CC0). Variants and language usage may vary by region.
What are the nicknames for Guillermo?
Famous People Named Guillermo
- Guillermo del Toro — Mexican film director and Academy Award winner for The Shape of Water
- Guillermo Ochoa — Mexican international goalkeeper
- Guillermo Stábile — Argentine footballer, top scorer of the first World Cup
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Sibling Name Ideas for Guillermo
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Frequently Asked Questions
What does the name Guillermo mean?
Guillermo is a boy name of Spanish origin meaning "Resolute protector." Guillermo is the Spanish form of William, from the Germanic wil, "will" or "desire," and helm, "helmet" — the name the Normans took to England and the Visigoths had already taken to Spain. It has been in American birth records since 1885 and in the top thousand since 1892, one of the longest continuous runs of any Spanish name in the United States.
How do you pronounce Guillermo?
Guillermo is pronounced gee-YER-moh. Common variations include Guilherme, William, Guglielmo.
Is Guillermo a boy name?
Yes, Guillermo is traditionally a boy name. Popular nicknames include Memo, Willy, Guille.