Name Awesome

Guillaume

Boys' name

Form of William

Guillaume has been given to 342 babies in the U.S. since 1967. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1997, with 19 recorded.

Babies named Guillaume, 2024

1 in 557,000

Guillaume over time, 1880–2025

Boys
0510152018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Guillaume: meaning, origin, and history

Form of William

French

What Guillaume means

Guillaume is a form of William.

Documented naming usage and pronunciation

Guillaume is used in French.

Another recorded pronunciation is /ɡi.jom/ for Guillaume.

Meaning behind the documented name family

The name developed through Guillaume → William. The family’s meaning is “will + helmet”, recorded in English with the source elements wiljô and helmaz.

Dictionary etymologyReferences, data & attribution

From French. Doublet of Guillermo, William, and Wilhelm, etc.

Excerpt from Wiktionary: Guillaume (English) · CC BY-SA 4.0

Wiktionary material is available under CC BY-SA 4.0.

Origin, language, and formation

Guillaume is used in English, French and Old French. Its origins include French.

Related names and everyday forms

Related names include William, Willame, Guillermo and Wilhelm.

Pronunciation and spelling

In French, Guillaume is pronounced /ɡi.jom/.

American usage and historical context

In the United States, 342 boys were recorded with the name Guillaume between 1967 and 2024. Its highest annual count was 19 in 1997; its best national rank was #3,643 in 1997.

How common is Guillaume?

Guillaume had fewer than 5 recorded uses in 2025, so these figures use 2024, the last year it was published.

Among all babies, 2024
1 in 557,000
6 of 3,342,801 births
Among boys only
1 in 287,000
<0.01% of boys
Rank, 2024
Unranked
Fewer than 5 uses
Coin-flip room size
386,177 kids
Even odds of a second one

Where Guillaume sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2024 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 386,177 children born in 2024 and it's an even bet that one of them is another Guillaume. In a class of 30 the chance is Under 1%.

When Guillaumes were born

Half of everyone ever recorded as Guillaume was born before 1996 — so the typical Guillaume is around 29 today.

Median birth year
1996
About 29 years old
Biggest decade
1990s
33.3% of all use
Born in the last 25 years
31.6%
Spread across generations
Recorded since 1950
342
People you could plausibly meet
Choose a decade

1990s — 33.3% of all recorded uses (114).

Is Guillaume rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 1997 (19)
Years since peak
28
Years
Year-to-year steadiness
Volatile
37.6% average annual change
Best rank ever
#3,643
1997

Guillaume around the world

Where Guillaume ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1996–2024
    #5,120
    in 2024
  • France
    1900–2025
    #953
    in 2025
  • Canada
    1991–2024
    #2,328
    in 2024
  • South Australia
    1986–2009
    #708
    in 2009

Popularity data from Office for National Statistics, Institut national de la statistique et des études économiques, Statistics Canada and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence. CBS SA data under CC BY 4.0.

Guillaume by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#3,643
1997
Peak year
1997
19 that year
First recorded
1967
Last recorded
2024
All-time count
342
Count in 2025
Under 5

Names similar to Guillaume

Matched on shared beginnings and endings, similar length, and comparable popularity.

GuilhermeGuiseppeGuilfordGuillermoGuinnessGuinnGuilianoGuiseppiGuilbertGuilioGuistinoGuidoGuilianGuilmarGuileOghenebrumeGuinHume

Sibling names for Guillaume

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Guillaume

Top names of 1997, Guillaume's peak yearThe 1990s in fullOther names that peaked in 1997Boys' names starting with GWilliam Variations & Nicknames