What origin is the name Guilielmus?

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

What are good sister names for Guilielmus?

Names from the same latin tradition pair naturally with Guilielmus — for example Olivia, Ava, Emily. You can browse more on our latin names page.

Guilielmus

Discover the meaning and origin of the name Guilielmus

Guilielmus

Boy

Latin

3 syllables

Guilielmus is a Latin boy's name meaning "Resolute protector".

Guilielmus is a boy name of Latin origin meaning "Resolute protector". At 10 letters it is a longer name, which leaves room for a nickname. It has 3 syllables.

Origin: Latin
Gender: Boy
Syllables: 3

Last updated 24 October 2026.

Meaning

Resolute protector

Popularity

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

Quick answers about Guilielmus

What does Guilielmus mean?

Guilielmus is a boy name of Latin origin meaning "Resolute protector".

How popular is Guilielmus?

We have no birth-record ranking for Guilielmus: 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.

Sister names that go with Guilielmus

Olivia Ava Emily Grace Victoria Camila

How to say Guilielmus

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Name numerology

8is the Chaldean number for Guilielmus.

Number 8 is linked with ambition, strength and determination.

More names with number 8

Numerology is a cultural tradition for fun, not a prediction.

Combine Guilielmus with another name

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Names with a similar meaning to Guilielmus

Guilielmus means "Resolute protector" — these names share that spirit.

William — "A name of Germanic origin meaning resolute protector or strong-willed warrior, used by Indian Christians." (German)
Liam — "Strong-willed warrior and protector" (Irish)
Michael — "Who is like God, referring to the archangel who serves as a protector and warrior." (Hebrew)