How Many People Are Named Casimiro?
An estimated 637 people in the United States have the first name Casimiro. It is almost exclusively a male name. The average bearer is 49 years old, and Casimiro peaked in popularity in 1921 with 28 births that year.
Below you will find a full statistical profile of Casimiro 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 Casimiro paired with any surname.
Estimated Living Americans
637
About 1 in 538,076 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
49
years old
Peak Year
1921
28 births
Total Registered
1,078
since 1880
Gender Distribution for Casimiro
Casimiro is almost exclusively a male name. Out of 1,078 total births registered, 100.0% were male.
Casimiro as a male name
Ranked #12,538 in 2023
5 male births in 2023
Peak: 1921 (28 births)
Casimiro: Popularity Over Time
SSA records for Casimiro span from the 1880s to the 2020s, covering 13 decades of naming data. The most popular decade for this name was the 1920s, when 170 babies were registered. Casimiro has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Casimiro by Decade
How has Casimiro 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.
Casimiro by State
Birth registrations for Casimiro span all 3 states and territories in the SSA database. The highest counts are in Texas, California, New Mexico. The lowest are in New Mexico, California, Texas. On average, about 157 Casimiros were registered per state.
Casimiro + Last Name Combinations
How many people share a full name with Casimiro as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Casimiro
Other first names starting with C with a similar number of bearers.
Casimiro: Questions and Answers
How many people in the U.S. are named Casimiro?
We estimate approximately 637 people named Casimiro 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 538,076 Americans share this first name.
Is Casimiro a common name?
Casimiro is classified as "Very Rare" and is more popular than 86.8% of all first names in the SSA database. A total of 1,078 births have been registered with this name since 1880.
When was Casimiro most popular?
Casimiro reached peak popularity in 1921, when 28 babies were given this name. The average age of a living person named Casimiro is approximately 49 years old, reflecting when the name was most commonly given.
Is Casimiro a male name?
Casimiro is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Casimiro Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Casimiro Smith, Casimiro Johnson, Casimiro 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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