Casimer
One of Polish origin meaning "he who demolishes" or "destroyer of peace".
Name Census estimates that about 235 living Americans carry the first name Casimer. The name is used almost exclusively for boys. The average person named Casimer today is around 76 years old, and the year with the single highest number of Casimer births was 1918 (135 babies).
This page is the full Name Census profile for Casimer. 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.
Key insights
- • The typical person named Casimer is about 76 years old today, placing it firmly among the names of earlier generations. Most living Casimers were born before 1960.
People living today
235
~ 1 in 1,458,529 Americans
Peak year
1918
135 babies that year
Average age
76
years old
2017 SSA rank
#12,604
Tracked since 1895
Census
Casimer in the 2020 Census
The 2020 Census recorded 364 people with the first name Casimer, which placed it at #25,851 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
#25,851
National first-name rank
People counted
364
364 in the published race/origin table
Per 100,000
0.1
People with this name in 2020
Largest reported group
White
90.9% of people with this name
Demographics
Ancestry and ethnicity for Casimer
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Casimer is White at 90.9%. The next largest groups are Two or More Races (3.8%) and Black (2.7%). 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 Casimer 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 Casimer at the time of the 2020 Census, not any inherent property of the name itself.
- White90.9% · 331
- Two or more races3.8% · 14
- Black or African American2.7% · 10
- Hispanic or Latino1.6% · 6
- American Indian and Alaska Native0.5% · 2
- Asian and Pacific Islander0.3% · 1
Popularity
Casimer: popularity over time
The SSA tracks Casimer from the 1890s through to the 2010s, spanning 13 decades of birth certificate data. The biggest single decade for the name was the 1910s, with 767 total registrations. Usage has dropped considerably from its 1910s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Casimer 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 Casimer during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Geography
Where Casimers live
The SSA's state-level files cover 10 states and territories. Illinois, New York, Michigan recorded the most babies named Casimer, while Wisconsin, Massachusetts, Connecticut recorded the fewest. The average across all reporting states is about 120 registrations each.
Origin
Meaning and history of Casimer
The name Casimer has its origins in the Polish language and culture, dating back to the Middle Ages. It is derived from the Slavic root words "kazic" meaning "to destroy" and "mir" meaning "peace," implying the name's meaning as "the destroyer of peace." This name was initially popularized in Poland and later spread to other Slavic regions.
One of the earliest recorded uses of the name Casimer can be found in the chronicles of the 11th century Polish ruler, Casimir I the Restorer, who reigned from 1034 to 1058. He was known for restoring Poland's power and influence after a period of internal strife and foreign invasions, earning him the epithet "the Restorer."
Another notable historical figure bearing this name was Saint Casimir (1458-1484), the patron saint of Poland and Lithuania. He was a prince from the Jagiellon dynasty and was renowned for his piety, asceticism, and devotion to the Virgin Mary. His life and virtues were celebrated in various religious texts and hagiographies.
In the 16th century, Casimir III, also known as Casimir the Great (1310-1370), was a celebrated Polish king who presided over a period of economic prosperity, territorial expansion, and cultural renaissance in Poland. He is widely regarded as one of the most influential and respected rulers in Polish history.
During the Renaissance period, the name Casimir gained popularity across Europe, with notable figures such as Casimir Delavigne (1793-1843), a French poet and dramatist, and Casimir Pulaski (1745-1779), a Polish military leader who fought in the American Revolutionary War and is considered a national hero in both Poland and the United States.
In more recent times, Casimir Funk (1884-1967), a Polish-American biochemist, is credited with discovering vitamins and coining the term "vitamine" (later changed to "vitamin"). He made significant contributions to the understanding of nutritional deficiencies and their impact on human health.
It is worth noting that the name Casimer has been subject to various spelling variations throughout history, such as Kazimierz, Kasimir, and Casimir, reflecting the linguistic and cultural influences of different regions and time periods.
People
Casimer + last name combinations
How many people share a full name with Casimer 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
Casimer: questions and answers
How many people in the U.S. are named Casimer?
Name Census puts the figure at roughly 235 living Americans. We arrive at this by taking every SSA birth registration for Casimer 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 1,458,529 US residents.
Is Casimer a common name?
We classify Casimer as "Very Rare". It ranks above 76.3% of all first names in the SSA dataset by living bearers. Across the full history of the data, 1,895 babies have been registered with this name.
When was Casimer most popular?
The single biggest year for Casimer was 1918, when 135 babies received the name. The fact that the average living Casimer is about 76 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
How common was Casimer in the 2020 Census?
The published 2020 Census first-name tables recorded 364 people with the name Casimer, or 0.12 per 100,000 residents. That placed it at #25,851 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 Casimer 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 Casimer?
In the 2020 Census sex table, Casimer appears almost entirely male. Of the 357 people counted with this name, 100.0% were male and only a very small share were female. 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 Casimer?
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Casimer is White at 90.9%. The next largest groups are Two or More Races (3.8%) and Black (2.7%). 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 Casimer most often in the Census?
White is the largest reported group for people named Casimer in the 2020 Census, accounting for 90.9% (331 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 Casimer in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Casimer a male name?
Yes, 100.0% of people registered as Casimer 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 Casimer still being used today?
Yes. The SSA still recorded Casimer 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 Casimer 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 common is the name Casimer?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.