Guillermo

In the United States, 1,718 babies were named Guillermo between 2020 and 2025.

Shape drawn from US Social Security baby-name records. Guillermo peaked in the 1990s and the 2020s in nearly equal measure. In US birth records Guillermo has stayed between 1,495 and 6,496 births in every decade since the 1950s: a name everyone knows and few children get.

Births with a Social Security record. Source: U.S. Social Security Administration

See the full list for the United States →

In Montevideo, 59 boys named Guillermo were born in 2011, spelling variants counted together.

share of that year’s births on record

Births in the department of Montevideo (not all of Uruguay) by first name and year of birth, 1940–2011, from the city’s civil registry, which writes names in capitals, almost always without accents; counted as spelling groups (accent and punctuation variants merged), nothing is withheld at source, and 2012 is excluded as a partial year. Source: Servicio de Registro Civil, Intendencia de Montevideo, Partidas de Registro Civil de Montevideo (Licencia de Datos Abiertos - Uruguay); 2012 dropped as partial

See the full list for Montevideo →

In Spain, 73,808 residents are named Guillermo, the 61st most common name among men, with a mean age of 36.3 years.
In Spain, Guillermo was the 47th most common name among boys born in 2024.

Residents of Spain on 1 January 2025. Spain publishes how old a name’s living bearers are, not a birth series, so there is no year chart. Source: INE (Spain), Censo de Población anual, 1 January 2025

See the full list for Spain →

In Mexico City, there were 90 registrations of Guillermo in 2022.

share of that year’s registrations in the city

Civil-registry acts in Mexico City by registration year. Counts are lower bounds (names under 6 in a month and borough are removed at source) and count name-instances, not people; compound names are split, so “Maria Jose” counts under each part. 2023 (3 registrations through 3 Mar) is excluded as partial. Source: Registro Civil of Mexico City, open data portal, registered given names 2000-2023

See the full list for Mexico City →

In Chile, 120 boys were registered as Guillermo in 2021, every accent spelling counted together.

share of that year’s name registrations

First-name registrations with Chile’s civil registry by year of registration, 1920–2021, counted as spelling groups (Sofía, Sofia and Sofìa are one name, shown with its most-registered spelling); the registry withholds nothing, nametree keeps the groups that reached 5 registrations in some year, and shares divide by every registration of the year. Source: Servicio de Registro Civil e Identificación (Chile) via the guaguas package, first-name registrations 1920-2021

See the full list for Chile →

In Argentina, 227 newborns were given the name Guillermo in 2024.

share of that year’s name registrations

Given-name components of births in Argentina 2012–2024; national cells are lower bounds and no sex split is published. Source: RENAPER (Argentina), Dirección Nacional de Población, given names 2012-2024

See the full list for Argentina →

In Puerto Rico, 6 babies were named Guillermo in 2025, and 526 have carried the name since 1998.

share of that year’s births on record

First given name only, from Social Security records of births in Puerto Rico; any name-sex-year under 5 births is withheld at source. Shares divide by the Puerto Rico Demographic Registry’s count of births on the island; the 2025 count is provisional. Source: U.S. Social Security Administration, territory name file (Puerto Rico)

See the full list for Puerto Rico →

At the 2022 census, 675 people in Brazil were named Guillermo, ranked 10,860th, with a median age of 38.
Among people named Guillermo living in Brazil at the 2022 census, more were born in the 1980s than in any other decade.

people alive at the 2022 census, by decade of birth

The census also counted 27 born between 2020 and August 2022, too recent a span to chart. People alive and resident in Brazil at the 2022 census, a living-population count, not births; names under 20 are withheld at source. Source: IBGE, Censo Demográfico 2022

See the full list for Brazil →

Guillermo is not on the 2024 record for Canada, where names under 5 in a year are excluded at source.

share of that year’s name registrations

First given names from provincial and territorial vital statistics across Canada; any name-sex-year under 5 is excluded at source, and small Quebec counts carry a randomized adjustment made at source. Shares divide by Statistics Canada’s count of live births for the year; the 2024 count is preliminary. Source: Statistics Canada, first names at birth (table 17-10-0147-01)

See the full list for Canada →

Guillermo is not on the 2025 record for England and Wales, where spellings under 3 in a year are withheld at source.
The count never rose above 8 in a year, too few to chart.

Birth registrations in England and Wales (not the whole UK); exact spellings are counted separately, and any spelling under 3 in a year is withheld at source. Source: Office for National Statistics, baby names in England and Wales

See the full list for England and Wales →

Guillermo is not on the 2025 record for Poland, where names given fewer than 2 times in a year are withheld at source.
The count never rose above 2 in a year, too few to chart.

First names given to children born in Poland by year of birth, 2000–2025, from the PESEL population register (Ministry of Digital Affairs); exact spellings count separately (Łukasz and Lukasz are different names), names given fewer than 5 times in a year were left off the list through 2012 and fewer than 2 times from 2013, and the register also counts children born abroad, so its yearly sums run above Poland’s live births. Shares divide by the register’s own published total for the year, never by births. Source: Ministry of Digital Affairs, PESEL register (dane.gov.pl)

See the full list for Poland →

Guillermo is not on the 2017 record for South Australia, whose registry publishes every name given that year.
The count never rose above 1 in a year, too few to chart.

Births registered in South Australia (not all of Australia) by first name and year of registration, 1944–2017, from the state’s Births, Deaths and Marriages registry, which publishes every name down to a single birth in capitals; a spelling its export repeats inside a year is counted once, and from 2018 only a top 100 is published, so the series ends at 2017. Source: Consumer and Business Services (South Australia), popular baby names

See the full list for South Australia →