Guillermo

Did you know?

A few things about Guillermo you might not know, from US birth records and Wikipedia. Handy for convincing a partner, or a grandparent.

⭐ Famous Guillermo

Guillermo del Toro

Mexican filmmaker and author (born 1964)

Choose Guillermo and your child shares a first name with Guillermo del Toro, a Mexican filmmaker and author. A ready-made answer when someone asks “Guillermo, like who?” Guillermo del Toro's Wikipedia article is available in 76 languages, a good sign of just how widely known they are.

Read about Guillermo del Toro on Wikipedia ↗ (opens in a new tab)

Photo: Gabriel Brooks, CC BY 4.0 (opens in a new tab), via Wikimedia Commons

• 👶How commonAbout 1 in every 6,468 baby boys born in the US in 2025 was named Guillermo, 264 babies in all. In a typical school of 500 kids, your Guillermo would very likely be the only one.
• 📜HistoryGuillermo first shows up in US birth records in 1885, the first year at least 5 babies got it. It has been in use for 140 years since.
• 🏆Best yearIts best year was 1996, when it reached #352.
• 📉Then vs nowGuillermo was 2.1× more common in 2000 than it is today. In 2000 it was given to about 1 in 3,017 baby boys; in 2025, about 1 in 6,468.
• 🍂TrendGuillermo has slipped 69 places over the last five years and now sits at #901. Good news if you want a familiar name that fewer kids will share.
• 📍Where it's lovedGuillermo is most popular in Arizona, where it ranks #432, followed by California (#509) and Nevada (#516). It's in the top 1,000 in 8 states.
• 💬MeaningGuillermo is a Spanish form of William, which means “resolute protector”. Our records link it to German, Hispanic and Spanish roots.

About the name Guillermo

Guillermo is a boy name of German, Hispanic and Spanish origin meaning “resolute protector”. It has 9 letters and 3 syllables, starting with G and ending in “-rmo”. US birth records list Guillermo for boys from 1885 to 2025, in 125 of those 141 years. Its best year was 1996, when it ranked #352 among boy names. In 2025 it ranked #901, with 264 babies.

Origin:German namesHispanic namesSpanish names