How Many People Are Named Casimir?
An estimated 1,703 people in the United States have the first name Casimir. It is almost exclusively a male name. The average bearer is 43 years old, and Casimir peaked in popularity in 1919 with 220 births that year.
Below you will find a full statistical profile of Casimir as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Casimir paired with any surname.
Estimated Living Americans
1,703
About 1 in 201,265 people in the U.S.
Rarity
Rare
Predicted Gender
Male
100.0% confidence
Average Age
43
years old
Peak Year
1919
220 births
Total Registered
5,174
since 1880
Gender Distribution for Casimir
Casimir is almost exclusively a male name. Out of 5,174 total births registered, 100.0% were male.
Casimir as a male name
Ranked #2,393 in 2024
58 male births in 2024
Peak: 1919 (220 births)
Casimir: Popularity Over Time
SSA records for Casimir span from the 1890s to the 2020s, covering 14 decades of naming data. The most popular decade for this name was the 1920s, when 1,404 babies were registered. Casimir has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Casimir by Decade
How has Casimir tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Casimir by State
Birth registrations for Casimir span all 16 states and territories in the SSA database. The highest counts are in Illinois, New York, Pennsylvania. The lowest are in Georgia, Florida, Texas. On average, about 196 Casimirs were registered per state.
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.
Names Similar to Casimir
Other first names starting with C with a similar number of bearers.
Casimir: Questions and Answers
How many people in the U.S. are named Casimir?
We estimate approximately 1,703 people named Casimir are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 201,265 Americans share this first name.
Is Casimir a common name?
Casimir is classified as "Rare" and is more popular than 93% of all first names in the SSA database. A total of 5,174 births have been registered with this name since 1880.
When was Casimir most popular?
Casimir reached peak popularity in 1919, when 220 babies were given this name. The average age of a living person named Casimir is approximately 43 years old, reflecting when the name was most commonly given.
Is Casimir a male name?
Casimir is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Casimir Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Casimir Smith, Casimir Johnson, Casimir Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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