What origin is the name Fitzwilliam?

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

What are good sister names for Fitzwilliam?

Names from the same irish tradition pair naturally with Fitzwilliam — for example Riley, Nora, Keira. You can browse more on our irish names page.

Fitzwilliam

Discover the meaning and origin of the name Fitzwilliam

Fitzwilliam

Boy

Irish

3 syllables

Fitzwilliam is an Irish boy's name meaning "Son of william.".

Parents who choose Fitzwilliam pick a boy name from the Irish tradition, meaning "Son of william.". At 11 letters it is a longer name, which leaves room for a nickname. It has 3 syllables.

Origin: Irish
Gender: Boy
Syllables: 3

Meaning compiled from public name lists.

Last updated 22 October 2026.

Meaning

Son of william.

Popularity

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

Quick answers about Fitzwilliam

What does Fitzwilliam mean?

Fitzwilliam is a boy name of Irish origin meaning "Son of william.".

How popular is Fitzwilliam?

We have no birth-record ranking for Fitzwilliam: 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.