Name Awesome

Guilherme

#9,191 in 2025Boys' name

Will-helmet

Guilherme has been given to 522 babies in the U.S. since 1921. In 2025 it ranked #9,191 of 13,926 boys’ names in use. Its peak year was 2006, with 39 recorded.

Babies named Guilherme, 2025

1 in 414,000

Guilherme over time, 1880–2025

Boys
01020304018801900192019401960198020002020

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Guilherme: meaning, origin, and history

Will-helmet

Deeper origin not confirmed in the cited records

What Guilherme means

Guilherme means “will-helmet”.

Origin, language, and formation

Guilherme is used in Portuguese.

Guilherme comes through Old French Willame, frk *Willahelm and Proto-Germanic *Wiljahelmaz.

Related names and everyday forms

Related names include William.

Pronunciation and spelling

In Portuguese, Guilherme is pronounced /ɡiˈʎɛʁ.mi/.

American usage and historical context

In the United States, 522 boys were recorded with the name Guilherme between 1921 and 2025. Its highest annual count was 39 in 2006; its best national rank was #2,895 in 2006.

Over 5 years its rank fell, from #7,184 in 2020 to #9,191 in 2025. Over 10 years its rank fell, from #6,808 in 2015 to #9,191 in 2025.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Guilherme?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 414,000
8 of 3,315,165 births
Among boys only
1 in 213,000
<0.01% of boys
Rank, 2025
#9,191
of 13,926 boys’ names in use
Coin-flip room size
287,238 kids
Even odds of a second one

Where Guilherme 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 2025 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 287,238 children born in 2025 and it's an even bet that one of them is another Guilherme. In a class of 30 the chance is Under 1%.

When Guilhermes were born

Half of everyone ever recorded as Guilherme was born before 2007 — so the typical Guilherme is around 18 today.

Median birth year
2007
About 18 years old
Biggest decade
2000s
49.2% of all use
Born in the last 25 years
82.8%
A modern name
Recorded since 1950
516
People you could plausibly meet
Choose a decade

2000s — 49.2% of all recorded uses (257).

Is Guilherme 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
+3,758
Places climbed
Rank vs 5 years ago
−2,007
Places dropped
Rank vs 10 years ago
−2,383
Places dropped
Births vs 10 years ago
0.67×
Fewer babies than then
Share of its own peak
20.5%
Peak was 2006 (39)
Years since peak
19
Years
Year-to-year steadiness
Volatile
30.1% average annual change
Best rank ever
#2,895
2006

Spellings of Guilherme

Guilherme is not the most common spelling — Guillermo is, with 98.4% against Guilherme's 1.6%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Guilherme is used

Across 1910–2025, Guilherme was most concentrated in Massachusetts — about 1 in 25,000 boys, against 1 in 85,997 across all states with data. It was least common in New Jersey (1 in —).

04 per 100,000

Most concentrated

  1. 1Massachusetts1 in 25,000
  2. 2Connecticut1 in 100,000
  3. 3Florida1 in —
  4. 4New Jersey1 in —

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Guilherme has too little recent state data to map, so this covers all years from 1910.

Guilherme around the world

Where Guilherme 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
    1998–2024
    #5,120
    in 2024
  • Ireland
    2007–2008
    #529
    in 2008
  • France
    1967–2025
    #3,890
    in 2025
  • Canada
    2005–2010
    #2,676
    in 2010

Popularity data from Office for National Statistics, Central Statistics Office, Institut national de la statistique et des études économiques and Statistics Canada. ONS data under Open Government Licence v3.0. CSO data under CC BY 4.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence.

Guilherme by the numbers

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

As a boy's name

Rank in 2025
#9,191
Trend vs 5 yrs ago
Down 2,007
Best rank ever
#2,895
2006
Peak year
2006
39 that year
First recorded
1921
Last recorded
2025
All-time count
522
Count in 2025
8

Names similar to Guilherme

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

GuillaumeGuiseppeGuilfordGuillermoGuinnessGuinnGuilianoGuiseppiGuilbertGuidoGuilioGuistinoGuilianGuilmarStormeGuileJermeGuin

Sibling names for Guilherme

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 Guilherme

Top names of 2006, Guilherme's peak yearThe 2000s in fullOther names that peaked in 2006Boys' names starting with GPortuguese Boy NamesWilliam Variations & Nicknames