Guillermo

given name · Spanish · Latin script

Recorded as a male name· opposite-gender records fall within measured source noise

Guillermo is a given name, most frequently recorded in Argentina, where it is the 99th most common given name. It appears chiefly in Spanish and English, written in the Latin script. Recorded meaning: Germanic Wilhelm, from will/wille 'will, decision' + helm 'helmet, protection': 'protected by his will'.

rarermore common
  • CLChile1 in 283◐
  • ARArgentina1 in 399
  • MXMexico1 in 452

carrying the name, one hue, darker where it is more common. Hover a country for its figure.

≈169K ●

across 9 countries

#584 ●

of 16M given names

Sources
428 ●

2.9M records

Official registry-verified

1 in 678 ◐

Spain

Meaning & origin●

Germanic Wilhelm, from will/wille 'will, decision' + helm 'helmet, protection': 'protected by his will'.

Sources 1

  • Diccionario etimológico de nombres propios

Attested across 13 languages in the etymology graph.

Where in the world●

Sorted by bearers counted by national registers, records where none counts.

Where Guillermo is recorded, by country
CountryMost common spellingSources
AR Argentina#991,714,3941M rec.—1.1KGuillermo175
MX Mexico#84702,835567K rec.—2KGuillermo248
PE Peru#72389,896312K rec.——Guillermo128
CL Chile#50317,98317K rec.—120Guillermo151
VE Venezuela#107230,643120K rec.——Guillermo103
CO Colombia#95110,39340K rec.—50Guillermo172
ES Spain#11073,80886K rec.1 in 67874KGuillermo228
US United States#78761,713344K rec.1 in 5.4K62KGuillermo428
PH Philippines#39255,76485K rec.——Guillermo86
EC Ecuador#12224,071△1.6K rec.1 in 70224KGuillermo78
CR Costa Rica—7,42839K rec.1 in 6867.4K—101
PY Paraguay#8911,00717K rec.——Guillermo55

Country figures for a list of names, at full precision, are available under licence rather than by scraping this table. How that works.

Languages●

  • Spanish4.4M83%
  • English342K6%
  • Catalan74K1%
  • 59K1%
  • Portuguese47K1%
Show as table
Languages in which the name is recorded
NameRecordsNote
Spanish4,402,52883%
English342,4086%
Catalan73,8391%
59,0651%
Portuguese46,7341%

Language is read off each record's context, not declared by the bearer; a share is of all records for this spelling.

Other names spelled this way◐

Guillermo is also recorded as 4 other names, grouped separately because the records behind them do not connect to the one described above.

  • English given name409K records spelled Guillermo7 spellings in the group

    Most recorded in United States, Venezuela, Ecuador, Costa Rica

    Languages: English, Dutch, Western Frisian

    Also written 'Guillermo, Guïllërmö

  • a separate given name70K records spelled Guillermo2 spellings in the group

    Most recorded in United States, Ecuador, Spain, Peru

    Also written Guíllermo

  • Lao given name7.4K records spelled Guillermo9 spellings in the group

    Most recorded in Laos, United States, Chile, Thailand

    Languages: Lao, Thai

    Also written Güïllërmö, Güillermo, ̺̿g̺̿u̺̿i̺̿l̺̿l̺̿e̺̿r̺̿m̺̿o̺̿, Ğüîllermö, Gúíllérmó

  • Polish given name7.2K records spelled Guillermo19 spellings in the group

    Most recorded in Poland, United States, Spain, Peru

    Languages: Polish, Russian, Czech

    Also written Гильермо, Гільєрмо, Гуіллермо, Гиллермо, Гуйллермо

75 further groups record this spelling and are not listed here.

Grouping is the name graph's, not a register's: two spellings join a group when the evidence links them, so a group is a claim about the records rather than about the people.

Other recorded senses●

Guillermo is also recorded in 5 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.

  • From German Wilhelm or English }) William (see main dictionary).

    as a nameA concise dictionary of first names

  • In Spanish, from the personal name Guillermo, Spanish equivalent of William.

    as a nameDictionary of American Family Names

  • In Spanish, a surname originating as a patronymic, denomination from Guillaume

    as a wordkaikki.org Wiktionary extract (IPA + transliterations)

  • protector

    as a nameDicionario Sefaradi De SobrenomesDictionary Of Sephardic Surnames Inclusive Cristaos-Novos, Conversos, Marranos, Italianos,…

  • In English, in Argentina. Paraguay, Uruguay

    as a namePronouncing Dictionary of Proper Names

Ordered by how much of this spelling's record each language holds, so a sense from a language the name is barely used in sits last rather than first.

Over time●

0200400600800190019502000693 · 1998

Show as table
Guillermo in SSA — National Baby Names (1880–present), United States, 1885–2025
Yearrecords
18855
18928
18975
19006
190410
190510
19076
19087
19095
191013
191110
191218
191316
191426
191533
191620
191740
191834
191943
192068
192144
192257
192389
192487
192588
1926107
1927100
192887
192994
1930101
1931100
193271
193374
193486
193572
193679
193767
193870
193963
194071
194189
194253
194379
194477
194594
194693
1947114
1948136
1949137
1950127
1951133
1952134
1953126
1954149
1955150
1956172
1957158
1958162
1959184
1960191
1961171
1962185
1963193
1964192
1965203
1966194
1967242
1968292
1969244
1970290
1971314
1972281
1973347
1974349
1975349
1976360
1977351
1978322
1979394
1980395
1981428
1982437
1983423
1984412
1985432
1986405
1987388
1988511
1989532
1990587
1991582
1992659
1993654
1994675
1995623
1996692
1997632
1998693
1999665
2000651
2001620
2002626
2003595
2004639
2005616
2006621
2007610
2008583
2009534
2010457
2011408
2012392
2013348
2014376
2015389
2016322
2017289
2018314
2019320
2020275
2021299
2022287
2023294
2024299
2025264

US SSA — National Baby Names (1880–present) — 125 years between 1885–2025. One register's own figures, never a sum across registers: two registers counting the same people would double them.

Notable people with this name●

1850190019502000Wilhelm von Hohenzollern, b. 1864Salvador Allende, b. 1908José López Portillo, b. 1920Guillermo Vilas, b. 1952Guillermo Lasso, b. 1955Guillermo Navarro, b. 1955Luis Guillermo Solís, b. 1958Guillermo del Toro, b. 1964Guillermo Ochoa, b. 1985Juan Guillermo Cuadrado, b. 1988

The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).

Evidence●

Attested in 76 sources across 36 countries.

Official registers attesting Guillermo
CountryRegisterYearCountRank
ES SpainINE — Padrón per-token widgets (current living counts, given + apellidos)—74K#129
ES SpainINE — Nombres más frecuentes (Padrón Municipal)—73K#59
US United StatesCensus Bureau — First Name Frequency 2020 by sex202062K#794
EC EcuadorINEC — civil registry names202424K#98
CR Costa RicaTSE — electoral roll (padrón) names—7.4K#93
US United StatesCensus Bureau — Surname Frequency 202020203.6K#8,791
US United StatesCensus Bureau — Surname Frequency 201020103.4K#9,581
US United StatesCensus Bureau — Surname Frequency 200020002.5K#11,647
MX MexicoRENAPO — name frequencies (eduardofv dataset)—2K#45
ES SpainINE — Apellidos más frecuentes (Padrón Municipal)—1.5K#3,067
ES SpainINE — Padrón per-token widgets (current living counts, given + apellidos)—1.5K#3,067
AR ArgentinaRENAPER — Apellidos (person counts, national)—1.1K—

Reference works 4

  • Dictionary of American Family Names
  • Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
  • Wikipedia given-name tokens
  • Wikidata name items (native-script + romanized given/family names)

These works list the name; their figures are licensed and are not reproduced here.

Register rows as of the 2026-09-12 data build · 969 rows in the corpus for this spelling.

Frequently asked questions

How common is the name Guillermo?
We estimate roughly 169 thousand people bear Guillermo (counting its spellings and scripts) across 9 countries in our records.
In which country does Guillermo have the most bearers?
Guillermo is most frequently recorded in Argentina, where it is most often spelled guillermo.
How common is Guillermo compared with other names?
In Argentina, Guillermo is the 99th most common given name of 517,176 given names recorded there.
Is Guillermo a male or female name?
Guillermo is a male name in our records. Opposite-gender entries fall within the cross-gender noise we measure in the source data, so we don't report them as usage.
What does the name Guillermo mean?
Recorded meaning: Germanic Wilhelm, from will/wille 'will, decision' + helm 'helmet, protection': 'protected by his will'.
Query this name via API
curl https://api.mondonomo.ai/api/v1/name-graph/guillermo

The same payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. Rate-limited for casual use. Bulk access and licensing.

About this data

● measured from records◐ inferred from the name graph○ machine-generated

Data snapshot . Figures are rebuilt periodically and will change.

Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.

Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.

Cite this page Mondonomo, “Guillermo” — the 99th most common given name in Argentina. Data snapshot 2026-09-12.

See how Guillermo parses inside a full name →