Guilherme
Meaning
Portuguese form of William ("will helmet"); one of Brazil's most common boys' names, with especially deep roots in the German-settled south
Say it: ghee-LYAIR-mee
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Guilherme has stayed rare in US records the whole time: no peak decade to name.
Popularity in Brazil
676,181 people · the #21 first name in Brazil · about 1 in 300 · median age 18
Among people named Guilherme living in Brazil at the 2022 census, more were born in the 2000s than in any other decade.
The census also counted 38,234 born between 2020 and August 2022, too recent a span to chart.
Source: IBGE, Censo Demográfico 2022
When you meet Guilherme
Most people given the name Guilherme in the United States are teenagers or young adults today.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Guilherme deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Guilherme 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 Guilherme fits with your family’s names and surname.
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