Guillermo meaning, boyGuillermo

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What does Guillermo mean?

Guillermo \gu(i)-ller-mo, guill(e)-rmo\ as a name for boys. Guillermo's name origin is Old German, and the name Guillermo means "determined protector". Guillermo is a form of Guillaume (Old German): French variant of William.


Guillermo has 36 related variations via Guillaume, William: Bill, Bille, Billie, Billy, Gillermo, Guglielmo, Guilherme, Gwillyn, Gwilym, Liam, Vilhelm, Villem, Wilek, Wiley, Wilhelm, Wilhelmus, Wilkes, Wilkie, Wilkinson, Will, Willem, Willhelmus, Willi, Williams, Williamson, Willie, Willis, Willkie, Wills, Willson, Willy, Wilmer, Wilmot, Wilmott, Wilson and Wim.


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. Census)

Displayed below is the birth name popularity of Guillermo for boys. Guillermo was first listed in 1900-1909 and reached its apex rank of #352 in the U.S. in the year 1996, and is at #678 currently. (Top 1000 Birth Names Statistics, 2014)

Top 1000 baby names ranking of Guillermo name in U.S.

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

Popular variation forms of Guillermo (#678 in 2014) are Liam (#2 in 2014), William (#5), Wilson (#594), Willie (#722), Will (#763), Billy (#794), Willy, Wilmer, Billie, Willis, Wilhelm, Wiley, Williams and Bill. Usage of these boy names was at its highest during 1920-1929 (usage of 0.5873%) and is now significantly lower (usage 0.2295%, down 60.9%), with versions such as Billy, Will, Guillermo, Willie and Wilson falling out of style. Liam (#2) is the most contemporarily stylish baby name among these. Displayed below is a comparison of the popularity of Guillermo and related names. (Top 1000 Birth Names Statistics, 2014)

Top 1000 baby names ranking of Bill, Billie, Billy, Guillermo, Liam, Wiley, Wilhelm, Will, William, Williams in U.S.

Top 1000 baby names ranking of Willie, Willis, Willy, Wilmer, Wilson in U.S.

Top 100 baby names ranking of Billy, Liam, Wilhelm, Will, William, Wilmer outside U.S.