GUILLERMO
ghee-YER-moh
A Spanish form of William, ultimately tied to the idea of a protective or resolute helmet.
Meaning
Guillermo is the Spanish form of William, a name of Germanic origin. The excerpted 19th-century source glosses it as “helmet of resolution,” reflecting the old Germanic elements usually associated with this name group: a protective helmet and a will or desire for resolve. The form is also shown alongside related variants such as Guilherme and Guilhelmus.
Origin
SpanishGermanicmasculine
Fun fact
The same name family appears across many languages, with English William, Spanish Guillermo, and Portuguese Guilherme all pointing back to the same old Germanic root.
Confidence: mixed. Sources: History of Christian Names, A list of Christian names, their derivatives, nicknames and equivalents in several languages.