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.
(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)
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)
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).
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.