Cassius Boy
How popular is Cassius?
#582 boy name in 2025
504 baby boys were named Cassius in the US in 2025, making it the 582nd most popular boy name.
Cassius popularity over time
Boys Girls
| Rank in 2025 | #582 for boys (▼ 13 from 2024) |
|---|---|
| Babies in 2025 | 504 boys |
| 10-year trend | Rising (+24% babies vs 2015) |
| Earlier ranks | #644 in 2015, #488 in 2020 |
| Peak year | 2021 (607 boys) |
| Highest rank | #425 in 1880 |
| First recorded | 1880 |
| Boys vs girls (last 10 years) | 99% boys, 1% girls |
| Chance a classmate shares it | 0.4% in a class of 25 kids born in 2025 |
Cassius counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Cassius family of names ranked #513 for boys in 2025 (#492 the year before), with 573 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Cassius | 504 | 88% |
| Kassius | 63 | 11% |
| Kasius | 6 | 1% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Cassius is most popular
Babies named Cassius per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
- New Mexico: 0.8 per 1,000 (25 boys)
- Washington: 0.7 per 1,000 (111 boys)
- Colorado: 0.6 per 1,000 (81 boys)
- Oregon: 0.6 per 1,000 (43 boys)
- Indiana: 0.5 per 1,000 (87 boys)
Cassius by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1880s | 82 | #425 |
| 1890s | 35 | #768 |
| 1900s | 5 | #1,372 |
| 1910s | 95 | #1,588 |
| 1920s | 112 | #2,019 |
| 1930s | 47 | #2,101 |
| 1940s | 59 | #2,114 |
| 1950s | 34 | #2,820 |
| 1960s | 309 | #860 |
| 1970s | 189 | #1,415 |
| 1980s | 211 | #2,094 |
| 1990s | 419 | #1,762 |
| 2000s | 1,225 | #946 |
| 2010s | 3,635 | #514 |
| 2020s | 3,279 | #487 |
Boy names about as popular as Cassius
Questions
- Is Cassius a boy or girl name?
- Cassius is mostly a boy name. Over the last 10 years, 99% of babies named Cassius were boys.
- How popular is the name Cassius?
- 504 baby boys were named Cassius in the US in 2025, making it the 582nd most popular boy name.
- When was Cassius most popular?
- Cassius peaked in 2021, when 607 boys were given the name. Its highest rank was #425 in 1880.
- How many people are named Cassius?
- 9,766 babies have been named Cassius in the US since 1880. We estimate about 9,212 of them are alive in 2026, with a median age of 9.
- Where is Cassius most popular?
- From 2021 to 2025, Cassius was most common in New Mexico, at 0.8 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.