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What does Guillermo mean?

Guillermo Pronunciation of Guillermo [guiller-mo] as a name for boys is an Old German name, 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).


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

Creative forms:


Middle name pairings:
Guillermo Olivier (G.O.), ..

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)

Guillermo reached its apex rank of #352 in the U.S. in the year 1996, and is at #660 currently. (Top 2000 Names, 2015)

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

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

Which version is better?

with its source forms and related boy names. The only other popular variation form of Guillermo (#660 in 2015) is William (#5 in 2015). 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%, 89% 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.

See names
in meaning and etymology.