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Guillermo

“Variant of William — Will and helmet” — Germanic via Norman French origin

Boy's name · #902 in the US (2025) · 90s

Guillermo reached #352 in 1996 and has eased to #902 since. About 32,000 boys have carried it since 1885.

Around the world: #48 in Spain (2024).

Appears in 2020-2025 birth records of 12 states. See the full state-by-state map on this page.

Famous Guillermos

• Guillermo Lasso — 55th President of Ecuador from 2021 to 2023
• Guillermo del Toro — Mexican filmmaker and author (born 1964)
• Guillermo Ochoa — Mexican association football player (born 1985)
• Guillermo Stábile — Argentine football player and manager
• Guillermo Vilas — Argentine tennis player

In stories & tradition

• Guillermo Almada — fictional human
• Guillermo Venegas Jr. — Los Venegas
• Guillermo — Adventure Time

What Guillermos become

Among 1,975 notable people named Guillermo:

Lawyers & judges appear 1.51× more often than among typical names — e.g. Guillermo Botero Nieto, Colombian lawyer (born 1948).

Similar names: Billy · Salvador · Jeronimo · Gerardo · Ernesto · Gustavo

Browse more boy names — popularity, trends and eras for 5,700+ American names, free.

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