Guillermo
Guillermo around the world
One shared root links 12 names across 3 languages.
Shared root: from Germanic Willahelm, wil "will, desire" + helm "helmet, protection"
The constellation
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Guillermo peaked in the 1990s and the 2020s in nearly equal measure.
See popularity in Brazil
Popularity in Brazil
675 people · the #10,860 first name in Brazil · about 1 in 333,333 · median age 38
Among people named Guillermo living in Brazil at the 2022 census, more were born in the 1980s than in any other decade.
The census also counted 27 born between 2020 and August 2022, too recent a span to chart.
Source: IBGE, Censo Demográfico 2022
When you meet Guillermo
Most people given the name Guillermo in the United States were born between 1970 and 2009. The Guillermo you meet today is most often in his 20s or 30s.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Guillermo deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Guillermo truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Guillermo fits with your family’s names and surname.
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