Guillermina

Girls' name

Feminine form of Guillermo

Guillermina has been given to 1,925 babies in the U.S. since 1918. 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 1966, with 40 recorded.

Babies named Guillermina, 2024

1 in 557,000

Guillermina over time, 1880–2025

Girls

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Guillermina: meaning, origin, and history

Feminine form of Guillermo

Deeper origin not confirmed in the cited records

What Guillermina means

Guillermina is a feminine form of Guillermo.

Documented naming usage and pronunciation

Guillermina is used in Spanish.

Another recorded pronunciation is /ɡi.ʝeɾ.ˈmi.na/ for Guillermina.

Meaning behind the documented name family

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

Related names and everyday forms

Related names include Guillermo and Wilhelmina.

Pronunciation and spelling

In Spanish, Guillermina is pronounced /ɡiʝeɾˈmina/.

American usage and historical context

In the United States, 1,925 girls were recorded with the name Guillermina between 1918 and 2024. Its highest annual count was 40 in 1966; its best national rank was #1,806 in 1966.

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 Guillermina?

Guillermina 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 girls only: 1 in 270,000; <0.01% of girls
Rank, 2024: Unranked; Fewer than 5 uses
Coin-flip room size: 386,177 kids; Even odds of a second one

Where Guillermina sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

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 Guillermina. In a class of 30 the chance is Under 1%.

When Guillerminas were born

Half of everyone ever recorded as Guillermina was born before 1971 — so the typical Guillermina is around 54 today.

Median birth year: 1971; About 54 years old
Biggest decade: 1970s; 18.2% of all use
Born in the last 25 years: 9.4%; Mostly a past generation
Recorded since 1950: 1,577; People you could plausibly meet

Choose a decade

1970s — 18.2% of all recorded uses (350).

Is Guillermina 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 1966 (40)
Years since peak: 59; Years
Year-to-year steadiness: Volatile; 27.5% average annual change
Best rank ever: #1,806; 1966

Where Guillermina is used

Across 1910–2025, Guillermina was most concentrated in California — about 1 in 25,000 girls, against 1 in 30,733 across all states with data. It was least common in Illinois (1 in —).

04 per 100,000

State popularity map

Most concentrated

1California1 in 25,000
2Texas1 in 25,000
3Arizona1 in 100,000
4Illinois1 in —

Shading is the share of that state's recorded girls 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. Guillermina has too little recent state data to map, so this covers all years from 1910.

Guillermina around the world

Where Guillermina 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.

France
1963–1963
#1,750
in 1963

Popularity data from Institut national de la statistique et des études économiques. INSEE data under Licence Ouverte / Etalab 2.0.

Guillermina by the numbers

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

As a girl's name

Rank in 2025: Unranked
Trend vs 5 yrs ago: —
Best rank ever: #1,806; 1966
Peak year: 1966; 40 that year
First recorded: 1918
Last recorded: 2024
All-time count: 1,925
Count in 2025: Under 5

Names similar to Guillermina

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

Sibling names for Guillermina

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

For a sister

Rona Dawna Rosita Collette Barbra Sarita Kandy Cami

For a brother

Deron Tad Darron Theron Daron Thad Kip Tracey

Explore around Guillermina

Top names of 1966, Guillermina's peak year The 1960s in full Other names that peaked in 1966 Girls' names starting with G