Name Awesome

Gillermo

Boys' name

Will + helmet, through Guillermo

Gillermo has been given to 633 babies in the U.S. since 1922. 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 1993, with 21 recorded.

Babies named Gillermo, 2011

1 in 732,000

Gillermo over time, 1880–2025

Boys
010203018801900192019401960198020002020

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Gillermo: meaning, origin, and history

Will + helmet, through Guillermo

Deeper origin not confirmed in the cited records

What Gillermo means

Gillermo belongs to the name family reached through Gillermo → Guillermo → William → William. Its meaning is “will + helmet”.

Origin, language, and formation

Gillermo is used in Basque.

Gillermo comes through Spanish Guillermo.

Related names and everyday forms

Related names include Guillermo and William.

Pronunciation and spelling

In Basque, Gillermo is pronounced /ɡiʎermo/.

American usage and historical context

In the United States, 633 boys were recorded with the name Gillermo between 1922 and 2011. Its highest annual count was 21 in 1993; its best national rank was #2,193 in 1972.

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 Gillermo?

Gillermo had fewer than 5 recorded uses in 2025, so these figures use 2011, the last year it was published.

Among all babies, 2011
1 in 732,000
5 of 3,657,935 births
Among boys only
1 in 380,000
<0.01% of boys
Rank, 2011
Unranked
Fewer than 5 uses
Coin-flip room size
507,099 kids
Even odds of a second one

Where Gillermo 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 2011 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 507,099 children born in 2011 and it's an even bet that one of them is another Gillermo. In a class of 30 the chance is Under 1%.

When Gillermos were born

Half of everyone ever recorded as Gillermo was born before 1978 — so the typical Gillermo is around 47 today.

Median birth year
1978
About 47 years old
Biggest decade
1990s
21.8% of all use
Born in the last 25 years
36.2%
Spread across generations
Recorded since 1950
506
People you could plausibly meet
Choose a decade

1990s — 21.8% of all recorded uses (138).

Is Gillermo 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 1993 (21)
Years since peak
32
Years
Year-to-year steadiness
Volatile
28.1% average annual change
Best rank ever
#2,193
1972

Spellings of Gillermo

Gillermo is not the most common spelling — Guillermo is, with 52.3% against Gillermo's 1.0%.

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 Gillermo is used

Across 1910–2025, Gillermo was most concentrated in California — about 1 in 100,000 boys, against 1 in 143,440 across all states with data. It was least common in Texas (1 in 100,000).

11 per 100,000

Most concentrated

  1. 1California1 in 100,000
  2. 2Texas1 in 100,000

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. Gillermo has too little recent state data to map, so this covers all years from 1910.

Gillermo 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
#2,193
1972
Peak year
1993
21 that year
First recorded
1922
Last recorded
2011
All-time count
633
Count in 2025
Under 5

Names similar to Gillermo

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

GildardoGilmoreGilfordGillisGilmanGillesGilmerGilvertoGilliamGilbertoGillieGiladGillianGilesGilmarGileadGildoGilliganGillGilsonGilletteGilchristGilroyGil

Sibling names for Gillermo

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 Gillermo

Top names of 1993, Gillermo's peak yearThe 1990s in fullOther names that peaked in 1972Boys' names starting with GBasque Boy NamesBasque Names