Kasimir

#11,340 in 2025Boys' name

Form of Casimir

Kasimir has been given to 80 babies in the U.S. since 1917. In 2025 it ranked #11,340 of 13,926 boys’ names in use. Its peak year was 2021, with 9 recorded.

Babies named Kasimir, 2025

1 in 553,000

Kasimir over time, 1880–2025

Boys

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Kasimir: meaning, origin, and history

Form of Casimir

Polish

What Kasimir means

Kasimir is a form of Casimir.

Documented naming usage and pronunciation

Kasimir is used in German (Rare).

Another recorded pronunciation is /ˈkaː.zi.miːɐ̯/ for Kasimir.

Meaning behind the documented name family

The name developed through Kasimir → Casimir. The family’s meaning is “proclamation of peace”, recorded in English.

Origin, language, and formation

Kasimir is used in German. Its origins include Polish.

Related names and everyday forms

Related names include Casimir.

Pronunciation and spelling

In German, Kasimir is pronounced /ˈkaːzimiɐ̯/.

American usage and historical context

In the United States, 80 boys were recorded with the name Kasimir between 1917 and 2025. Its highest annual count was 9 in 2021; its best national rank was #3,400 in 1917.

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 Kasimir?

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: #11,340; of 13,926 boys’ names in use
Coin-flip room size: 382,984 kids; Even odds of a second one

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

When Kasimirs were born

Half of everyone ever recorded as Kasimir was born before 2012 — so the typical Kasimir is around 13 today.

Median birth year: 2012; About 13 years old
Biggest decade: 2020s; 50.0% of all use
Born in the last 25 years: 76.3%; A modern name
Recorded since 1950: 66; People you could plausibly meet

Choose a decade

2020s — 50.0% of all recorded uses (40).

Is Kasimir 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: −2,678; Places dropped
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: 66.7%; Peak was 2021 (9)
Years since peak: 4; Years
Year-to-year steadiness: Steady; 11.4% average annual change
Best rank ever: #3,400; 1917

Spellings of Kasimir

Kasimir is not the most common spelling — Casimir is, with 50.1% against Kasimir's 0.76%.

Casimir50.1%5,248
Casimer18.1%1,895
Kashmir12.9%1,357
Casimiro10.3%1,084
Kasim7.8%817
Kasimir0.76%80

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.

Kasimir around the world

Where Kasimir 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
1924–1931
#952
in 1931
South Australia
1944–1987
#464
in 1987

Popularity data from Institut national de la statistique et des études économiques and Consumer and Business Services (South Australia). INSEE data under Licence Ouverte / Etalab 2.0. CBS SA data under CC BY 4.0.

Kasimir by the numbers

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

As a boy's name

Rank in 2025: #11,340
Trend vs 5 yrs ago: New entry
Best rank ever: #3,400; 1917
Peak year: 2021; 9 that year
First recorded: 1917
Last recorded: 2025
All-time count: 80
Count in 2025: 6

Names similar to Kasimir

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

Kasmir Kashmir Kashdon Kasheem Kashtin Kashdyn Kastle Kasaan Kasaun Kashden Kastiel Kaspen Kashmeir Kassian Kasani Kastin Kashis Kashten Kassiah Kashston Kashmier Kaspian Kaspar Kasius

Sibling names for Kasimir

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

Annabell Abagail Sydnie Sydni Rhianna Shyann Alysa Adelle

For a brother

Aaden Hamilton Caesar Brennen Tobin Jerimiah Jorden Henri

Explore around Kasimir

Top names of 2021, Kasimir's peak year The 2020s in full Other names that peaked in 1917 Boys' names starting with K