What does Guillermo mean?
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.
(female) 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)
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).
Similar NamesSuggested 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.