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Casimiro

#10,904 in 2025Boys' name

English equivalent of Casimir

Casimiro has been given to 1,084 babies in the U.S. since 1881. In 2025 it ranked #10,904 of 13,926 boys’ names in use. Its peak year was 1921, with 28 recorded.

Babies named Casimiro, 2025

1 in 553,000

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Casimiro: meaning, origin, and history

English equivalent of Casimir

Polish

What Casimiro means

Casimiro is a English equivalent of Casimir.

Origin, language, and formation

Casimiro is used in Italian, Portuguese and Spanish. Its origins include Polish.

Related names and everyday forms

Related names include Casimir.

Pronunciation and spelling

In Italian, Casimiro is pronounced /ka.ziˈmi.ro/.

American usage and historical context

In the United States, 1,084 boys were recorded with the name Casimiro between 1881 and 2025. Its highest annual count was 28 in 1921; its best national rank was #802 in 1881.

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 Casimiro?

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

Among all babies, 2025
1 in 553,000
6 of 3,315,165 births
Among boys only
1 in 285,000
<0.01% of boys
Rank, 2025
#10,904
of 13,926 boys’ names in use
Coin-flip room size
382,984 kids
Even odds of a second one

Where Casimiro 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 382,984 children born in 2025 and it's an even bet that one of them is another Casimiro. In a class of 30 the chance is Under 1%.

When Casimiros were born

Half of everyone ever recorded as Casimiro was born before 1956 — so the typical Casimiro is around 69 today.

Median birth year
1956
About 69 years old
Biggest decade
1920s
15.7% of all use
Born in the last 25 years
10.7%
Spread across generations
Recorded since 1950
621
People you could plausibly meet
Choose a decade

1920s — 15.7% of all recorded uses (170).

Is Casimiro 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
21.4%
Peak was 1921 (28)
Years since peak
104
Years
Year-to-year steadiness
Volatile
38.1% average annual change
Best rank ever
#802
1881

Spellings of Casimiro

Casimiro is not the most common spelling — Casimir is, with 63.8% against Casimiro's 13.2%.

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 Casimiro is used

Across 1910–2025, Casimiro was most concentrated in Texas — about 1 in 33,333 boys, against 1 in 67,087 across all states with data. It was least common in California (1 in —).

03 per 100,000

Most concentrated

  1. 1Texas1 in 33,333
  2. 2New Mexico1 in 100,000
  3. 3California1 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. Casimiro has too little recent state data to map, so this covers all years from 1910.

Casimiro around the world

Where Casimiro 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
    1960–1972
    #1,384
    in 1972

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

Casimiro by the numbers

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

As a boy's name

Rank in 2025
#10,904
Trend vs 5 yrs ago
New entry
Best rank ever
#802
1881
Peak year
1921
28 that year
First recorded
1881
Last recorded
2025
All-time count
1,084
Count in 2025
6

Names similar to Casimiro

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

CashmereCassielCashiusCasanovaCashtonCassianCaswellCassidyCastielCaspianCastonCashelCasimirCashtynCasparCastorCastleCasimerCashmirCasmirCashusCassiusCasynCassandra

Sibling names for Casimiro

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 Casimiro

Top names of 1921, Casimiro's peak yearThe 1920s in fullOther names that peaked in 1881Boys' names starting with CLong Boy Names