Guillermo

• Spanish:/ɡiˈʃeɾ.mo/●(recorded in a dictionary) from Wiktionary

Attested across 14 languages in the etymology graph.

Guillermo is one spelling over 2 language communities, and the dictionaries record it differently in 2 of them. Each row is what a source recorded for that language, beside the share of this name’s records the language holds. No single row is the name’s meaning.

• Spanish83%

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

  as a name·Diccionario etimológico de nombres propios

  from the personal name Guillermo, Spanish equivalent of William.

  as a name·Dictionary of American Family Names

  a surname originating as a patronymic, denomination from Guillaume

  as a word·kaikki.org Wiktionary extract (IPA + transliterations)

• English6.3%

  in Argentina. Paraguay, Uruguay

  as a name·Pronouncing Dictionary of Proper Names

The share is ours — how much of this name’s records each language holds. The sense beside it is the source’s, quoted and credited, including where it names a gender. We do not publish a gender of our own per language: our records carry one figure for the spelling as a whole.

Names that people choosing a name often weigh against Guillermo, most often first. They share a style rather than an origin.

• Alejandro
• Javier
• Eduardo
• Enrique
• Fernando

From the names suggested together in public name-advice forums, in English. A list of what people consider, not a measure of how common any name is.

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 name7 spellings in the group

  Most recorded in United States, United Kingdom, Philippines, Australia

  Languages: English, Dutch

  Also written 'Guillermo, Guïllërmö

• a separate name2 spellings in the group

  Also written Guíllermo

• Lao given name9 spellings in the group

  Most recorded in Laos, United States, Chile, Thailand

  Languages: Lao, Thai

  Also written Güïllërmö, Gúíllérmó, Ğüîllermö, Güillermo, Guillermô

• Polish given name19 spellings in the group

  Most recorded in United States, Peru, Spain, Czechia

  Languages: Polish, Russian, Czech

  Also written Гильермо, Гільєрмо, Гуіллермо, Гуйллермо, Гиллермо

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.

Guillermo is also recorded in 2 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 name·A concise dictionary of first names

• protector

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

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.

• José López Portillob. 1920MXnot in their usual name58th President of Mexico
• Guillermo Vilasb. 1952ARArgentine tennis player
• Guillermo del Torob. 1964MXMexican filmmaker and author (born 1964)

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).

A formal English salutation is built on the surname, so it needs a full name — on its own, a first name only supports the informal form.

78 registers and reference works attest this spelling, across 36 countries.

Register rows as of the 2026-10-09 data build.

What are other forms of the name Guillermo?

In the etymology graph, William, Willie and Bill are forms of the same name in other languages.

What does the name Guillermo mean, and where does it come from?

Germanic Wilhelm, from will/wille 'will, decision' + helm 'helmet, protection': 'protected by his will'. Recorded by Diccionario etimológico de nombres propios.

How do you pronounce Guillermo?

In Spanish /ɡiˈʃeɾ.mo/ (Wiktionary).

Which countries have the most people named Guillermo?

Mondonomo estimates about 387 thousand people named Guillermo in Mexico, more than in any other country we hold, where it is most often spelled guillermo. After it come Argentina, Colombia, Peru and Spain; the country table on this page ranks them.

Is Guillermo a male or female name?

Guillermo is a male name. National registers that list it by sex list it as male: Spain (INE), United States (Census Bureau, 2020), Ecuador (INEC, 2024) and Mexico (RENAPO), among others.

How common is the name Guillermo?

In Spain, the national register counted 73,808 people named Guillermo, about 1 in 678 residents.

How common is Guillermo compared with other names?

In Mexico, Guillermo is the 79th most common given name of 193,485 given names recorded there.