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The short answer
Cassius is a masculine name used in Ancient Roman. Behind the Name describes it this way: "Roman family name that was possibly derived from Latin cassus meaning ‘empty, vain’. Lucius Cassius Dio was a 3rd-century Roman historian." It ranked #583 for boys in the United States in 2025.
Meaning and etymology
According to Behind the Name, roman family name that was possibly derived from Latin cassus meaning ‘empty, vain’. Lucius Cassius Dio was a 3rd-century Roman historian. The entry lists its usage as Ancient Roman.
Editorial confidence: likely
Popularity
Cassius ranked #583 for boys in the United States in 2025. The figure comes from the Social Security Administration's national file for that year.
| Region | Year | Rank | Source |
|---|---|---|---|
| United States | 2025 | #583 | ssa-2025 |
If you like this name
Names that Behind the Name files under the same origin (Ancient Roman) and that sit near Cassius in the 2025 American rankings.
Similar by origin
Frequently asked questions
What does the name Cassius mean?
Cassius means "empty, vain", according to Behind the Name.
Is Cassius a popular name?
Cassius ranked #583 for boys in the United States in 2025. (Social Security Administration data).
Is Cassius a boy's or a girl's name?
In the 2025 SSA data Cassius appears in the boys' list; Behind the Name labels it masculine.
Sources
- Behind the Name: Meaning, origin and history of the name Cassius — supports meaning, usage, pronunciation, variants.
- U.S. Social Security Administration: Popular Baby Names — national data, year of birth 2025 — supports popularity.
