Guillermo

Meaning of Guillermo

Guillermo means "resolute protector" or "determined guardian."

Guillermo has Germanic roots — browse every Germanic baby name in our catalog.

Popularity of Guillermo

After ranking as high as #392 in 2000, Guillermo has fallen out of the US top 1,000 as of 2025.

Notable people named Guillermo

• Guillermo del Toro
  Film director and producer
• Guillermo Vilas
  Argentine tennis player
• Guillermo Diaz
  American actor
• Guillermo Mordillo
  Argentine cartoonist
• Guillermo Ochoa
  Mexican soccer player

More Germanic names

Questions about the name Guillermo

What does the name Guillermo mean?

Guillermo means guillermo means "resolute protector" or "determined guardian.", and it comes from Germanic origins.

Is Guillermo a boy's or a girl's name?

Guillermo is most commonly used as a boy's name in the United States.

How popular is the name Guillermo?

Guillermo did not appear in the top 1,000 baby names in 2025, which makes it a genuinely uncommon pick.

When was Guillermo most popular?

Guillermo peaked at #392 in 2000.