Meaning & Origin
a male given name from Spanish
Guillermo is a boy's and girl's baby name of Spanish origin, the Spanish form of William, from the Old Germanic Willahelm meaning "resolute protector" or "helmet of will." It has been one of the most enduring names in Spanish-speaking cultures for centuries.
Guillermo del Toro, the Oscar-winning director of Pan's Labyrinth and The Shape of Water, is perhaps the name's most celebrated contemporary bearer. With over 31,000 U.S. births recorded, Guillermo has been a beloved constant in Hispanic-American communities.