Casimir
A masculine name with Polish roots meaning "destroyer of peace".
Name Census estimates that about 1,703 living Americans carry the first name Casimir. The name is used almost exclusively for boys. The average person named Casimir today is around 43 years old, and the year with the single highest number of Casimir births was 1919 (220 babies).
This page is the full Name Census profile for Casimir. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
For a British comparison, Name Census UK has a UK baby-name profile for Casimir with official rankings and popularity over time.
People living today
1.7K
~ 1 in 201,265 Americans
Peak year
1919
220 babies that year
Average age
43
years old
2024 SSA rank
#2,393
Tracked since 1894
Census
Casimir in the 2020 Census
The 2020 Census recorded 1,713 people with the first name Casimir, which placed it at #8,462 in the published first-name tables. This is a snapshot of people who already had the name at the time of the Census.
The SSA sections elsewhere on this page answer a different question: how often parents gave the name to babies over time. The "people living today" figure on this page is different again: it is a current estimate built from SSA birth records and age-based survival rates, so the two numbers are not expected to match exactly.
2020 Census rank
#8,462
National first-name rank
People counted
1.7K
1,713 in the published race/origin table
Per 100,000
0.6
People with this name in 2020
Largest reported group
White
79.2% of people with this name
Demographics
Ancestry and ethnicity for Casimir
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Casimir is White at 79.2%. The next largest groups are Black (11.2%) and Hispanic (4.4%). These figures describe the people who had the name in 2020, not any inherent property of the name itself.
The bar chart below shows how people with the first name Casimir described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given name, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown so the breakdown is easy to read across every published category. Because the 2020 Census first-name file also includes raw headcounts for each group, Name Census can show those alongside the percentages in the legend and hover tooltip.
Keep in mind that these are self-reported numbers. A first name does not determine a person's race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the name Casimir at the time of the 2020 Census, not any inherent property of the name itself.
- White79.2% · 1,356
- Black or African American11.2% · 192
- Hispanic or Latino4.4% · 76
- Two or more races3.8% · 65
- Asian and Pacific Islander1.1% · 19
- American Indian and Alaska Native0.3% · 5
Popularity
Casimir: popularity over time
The SSA tracks Casimir from the 1890s through to the 2020s, spanning 14 decades of birth certificate data. The biggest single decade for the name was the 1920s, with 1,404 total registrations. Usage has dropped considerably from its 1920s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Casimir by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Casimir during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Geography
Where Casimirs live
The SSA's state-level files cover 16 states and territories. Illinois, New York, Pennsylvania recorded the most babies named Casimir, while Georgia, Florida, Texas recorded the fewest. The average across all reporting states is about 196 registrations each.
Origin
Meaning and history of Casimir
The name Casimir has its origins in the Polish language, derived from the Slavic elements "kazic" meaning "to destroy" and "mir" meaning "peace." It was initially used as a surname, believed to have emerged in the late 10th or early 11th century among the nobility of medieval Poland.
The name gained prominence due to its association with Saint Casimir, the patron saint of Poland, who lived from 1458 to 1484. Born as a prince of the Jagiellonian dynasty, he was known for his piety and commitment to celibacy, which contributed to the popularity of the name among devout Catholics.
One of the earliest recorded uses of the name Casimir can be found in the chronicles of Jan Długosz, a 15th-century Polish historian and author. Długosz's writings documented the life and legacy of Saint Casimir, further solidifying the name's significance in Polish culture.
Throughout history, several notable individuals have borne the name Casimir. Among them are Casimir III the Great (1310-1370), a renowned King of Poland who expanded the kingdom's territory and enacted important legal reforms. Casimir IV Jagiellon (1427-1492) was another influential Polish monarch who oversaw the country's Golden Age and the establishment of the Jagiellonian University.
In the realm of literature, Casimir Delavigne (1793-1843) was a French poet and playwright who gained recognition for his patriotic works during the Romantic era. Casimir Pulaski (1745-1779), a Polish nobleman and military leader, played a crucial role in the American Revolutionary War, earning him the title of "Father of the American Cavalry."
Another notable figure was Casimir Funk (1884-1967), a Polish-American biochemist credited with discovering vitamins and coining the term "vitamine" (later amended to "vitamin"). His groundbreaking research paved the way for our understanding of essential nutrients and their role in human health.
While the name Casimir has maintained its roots in Polish culture, it has also found its way into other languages and cultures, particularly in various European countries. However, its usage and popularity have fluctuated over time, reflecting cultural shifts and naming preferences.
People
Casimir + last name combinations
How many people share a full name with Casimir as the first name? Click a combination below to see the estimate, or search any pairing.
Related
Other names starting with C
Other first names starting with C with a similar number of bearers.
FAQ
Casimir: questions and answers
How many people in the U.S. are named Casimir?
Name Census puts the figure at roughly 1,703 living Americans. We arrive at this by taking every SSA birth registration for Casimir going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 201,265 US residents.
Is Casimir a common name?
We classify Casimir as "Rare". It ranks above 93% of all first names in the SSA dataset by living bearers. Across the full history of the data, 5,174 babies have been registered with this name.
When was Casimir most popular?
The single biggest year for Casimir was 1919, when 220 babies received the name. The fact that the average living Casimir is about 43 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
How common was Casimir in the 2020 Census?
The published 2020 Census first-name tables recorded 1,713 people with the name Casimir, or 0.57 per 100,000 residents. That placed it at #8,462 in the national Census ranking for first names.
Why is the Census count different from the living estimate?
Because they measure different things. The Census figure is a count of people who had the name Casimir in 2020. The living estimate aims to answer a current question instead: how many people with the name are alive today, based on SSA birth records and age-based survival rates. Since one number is a 2020 snapshot and the other is a present-day estimate, they are not expected to be identical.
What does the Census say about the gender split for Casimir?
In the 2020 Census sex table, Casimir leans strongly male. 1,678 people counted with this name were male (98.0%), compared with 34 female bearers (2.0%). The Census view is a snapshot of people living with the name in 2020, while the SSA section above tracks births across time.
What does the Census say about the background of people named Casimir?
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Casimir is White at 79.2%. The next largest groups are Black (11.2%) and Hispanic (4.4%). These figures describe the people who had the name in 2020, not any inherent property of the name itself. The percentages in the chart above come from self-reported race and Hispanic-origin responses in the 2020 Census.
Which group reports the name Casimir most often in the Census?
White is the largest reported group for people named Casimir in the 2020 Census, accounting for 79.2% (1,356 people in the published table).
Why can the Census sex total and race total differ slightly?
The Census Bureau published separate 2020 tables for sex and for race/Hispanic origin, and the released figures can differ slightly because of privacy protection in the public files. That is why this page treats the gender section and the race/origin section as two related snapshots instead of forcing them into one identical total.
Does every first name have Census demographic data?
No. The public Census first-name release only includes names that met the Bureau's publication rules, so many rarer names in the SSA files have no Census demographic snapshot. When that happens, the SSA trend, gender history, and state sections still appear, but the 2020 Census demographic sections are omitted.
What does the SSA popularity chart show?
The chart tracks births, not the number of people alive with the name today. Each point shows how many babies were given the name Casimir in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Casimir a male name?
Yes, 100.0% of people registered as Casimir in the SSA data are male. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Is Casimir still being used today?
Yes. The SSA still recorded Casimir in 2024, and the page above shows its latest-year rank where available. A name can be well past its peak and still remain in steady use, especially if it built up a large population over earlier decades.
Why can a name have a lot of living bearers even if it is not trendy now?
Because living-bearer counts and current baby-name popularity measure different things. A name like Casimir can build up a very large population over many decades, even if fewer parents are choosing it now than they did at its peak.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.
How many Americans are named Casimir?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.