What origin is the name Guillermo?

Guillermo comes from Spanish naming traditions. Names from this origin often carry meanings tied to nature, virtues or heritage.

What are good sister names for Guillermo?

Names from the same spanish tradition pair naturally with Guillermo — for example Elena, Ximena, Lola. You can browse more on our spanish names page.

Guillermo

Discover the meaning and origin of the name Guillermo

Guillermo

Boy

Spanish

3 syllables

Guillermo is a Spanish boy's name meaning "Form of william.".

Parents who choose Guillermo pick a boy name from the Spanish tradition, meaning "Form of william.". At 9 letters it is a longer name, which leaves room for a nickname. It has 3 syllables.

Origin: Spanish
Gender: Boy
Syllables: 3

Meaning compiled from public name lists.

Last updated 22 October 2026.

Meaning

Form of william.

Popularity

No birth-record data (source: not in US birth records; popularity in India is not tracked)

Quick answers about Guillermo

What does Guillermo mean?

Guillermo is a boy name of Spanish origin meaning "Form of william.".

How popular is Guillermo?

We have no birth-record ranking for Guillermo: it is not in US records, and India publishes no national name rankings. The meter above fills in as parents here view, search for and save the name.