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What does Guillermo mean?

Guillermo [guil-ler-mo] as a name for boys. Guillermo's name origin is Old German, and the name Guillermo means "determined protector". Guillermo is a Spanish form of Guillaume (Old German): French variation of William.

Associated with: determined (faithful), protector (defender).


Guillermo has 3 relations via Guillaume, William: Gillermo, Guglielmo and Guilherme.

Kreatif forms:
(male) Guilermo, Guillerdo, ..

(female) Guillerma, Guillerta, ..

How popular is Guillermo?

Guillermo is a very prominent first name for men (#379 out of 1220, Top 31%) and also a very prominent last name for both adults and children (#11647 out of 150436, Top 8%). (2000 U.S. Demographics)


Ranking and usage % can show different trends depending on the distribution of names that year.

Displayed below is the birth name popularity of Guillermo for boys. Guillermo reached its apex rank of #352 in the U.S. in the year 1996, and is at #678 currently. (Top 2000 Names, 2014)

Top 2000 baby names ranking of Guillermo name in U.S.

Top 100 baby names ranking of Guillermo outside U.S.

The only other popular variation form of Guillermo (#678 in 2014) is William (#5 in 2014). Adoption of these forms of Guillermo was widespread among parents during 1880-1889 (usage of 7.7%) and is now significantly lower (usage 0.9%, 88% less).

Top 2000 baby names ranking of Guillermo, William in U.S.

Top 100 baby names ranking of William outside U.S.

Similar Names


Suggested similar names are Gaillard, Gaille, Gaillen, Galtero (see Gauthier), Gellert, Ghilles (see Gillies), Gilbert, Gilberto, Gilderoy, Gillean, Gillen, Gilleoin, Gilleon, Gilles, Gillett, Gillette, Gilley, Gillray, Gillroy (see Gilroy), Gilmer, Gualterio, Gualtiero, Guilbert, Guilford, Guntero (see Gunther) and Quiller. These names tend to be less commonly used than Guillermo.