How Many People Are Named Cassius?
An estimated 8,725 people in the United States have the first name Cassius. It is almost exclusively a male name. The average bearer is 15 years old, and Cassius peaked in popularity in 2021 with 612 births that year.
Below you will find a full statistical profile of Cassius 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 Cassius paired with any surname.
Key Insights
- Cassius is a modern name. With an average bearer age of just 15, it has gained most of its popularity in recent years.
Estimated Living Americans
8,725
About 1 in 39,284 people in the U.S.
Rarity
Rare
Predicted Gender
Male
99.7% confidence
Average Age
15
years old
Peak Year
2021
612 births
Total Registered
9,259
since 1880
Gender Distribution for Cassius
Cassius is almost exclusively a male name. Out of 9,259 total births registered, 99.7% were male.
Cassius as a male name
Ranked #567 in 2024
516 male births in 2024
Peak: 2021 (607 births)
Cassius as a female name
Ranked #15,643 in 2023
5 female births in 2023
Peak: 2017 (7 births)
Cassius: Popularity Over Time
SSA records for Cassius span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 2010s, when 3,641 babies were registered. While Cassius is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Cassius by Decade
How has Cassius 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.
Cassius by State
Birth registrations for Cassius span all 44 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in North Dakota, West Virginia, South Dakota. On average, about 149 Cassiuss were registered per state.
Cassius + Last Name Combinations
How many people share a full name with Cassius as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cassius
Other first names starting with C with a similar number of bearers.
Cassius: Questions and Answers
How many people in the U.S. are named Cassius?
We estimate approximately 8,725 people named Cassius 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 39,284 Americans share this first name.
Is Cassius a common name?
Cassius is classified as "Rare" and is more popular than 97.5% of all first names in the SSA database. A total of 9,259 births have been registered with this name since 1880.
When was Cassius most popular?
Cassius reached peak popularity in 2021, when 612 babies were given this name. The average age of a living person named Cassius is approximately 15 years old, reflecting when the name was most commonly given.
Is Cassius a male name?
Cassius is predominantly male. 99.7% of people with this name are male. See the gender breakdown above for full details.
How many Cassius Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cassius Smith, Cassius Johnson, Cassius 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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