What Does the Name Cassius Mean?
Cassius is a boy's name of Latin (Roman family name / nomen) origin meaning “traditionally 'hollow, empty' (Latin 'cassus'); etymology debated.”
Updated June 2026
| Name | Cassius |
|---|---|
| Gender | male |
| Origin | Latin (Roman family name / nomen) |
| Meaning | traditionally 'hollow, empty' (Latin 'cassus'); etymology debated |
| Variants | Cassio, Cash (short form), Cas, Cassian (related) |
| Popularity | A revived classical name rising in U.S. and UK usage in the 2010s-2020s; well known via boxer Cassius Clay (later Muhammad Ali). |
The meaning and origin of Cassius
The name Cassius means “traditionally 'hollow, empty' (Latin 'cassus'); etymology debated” and has Latin (Roman family name / nomen) origins. Cassius is an ancient Roman nomen borne by the gens Cassia, most famously Gaius Cassius Longinus, one of Julius Caesar's assassins. It is commonly linked to Latin 'cassus' meaning hollow or empty, though the origin is uncertain and possibly Etruscan.
Variants and related names
Cassius is related to several other names you may recognize: Cassio, Cash (short form), Cas, Cassian (related). These share a common root or are spelling and language variants of the same name.
How popular is the name Cassius?
A revived classical name rising in U.S. and UK usage in the 2010s-2020s; well known via boxer Cassius Clay (later Muhammad Ali).
Popularity matters when you need believable test data: a name that fits the era or region you are modeling makes a generated profile look real. You can generate a complete fictional profile using the name Cassius below.
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Open the name generator →Frequently asked questions
What does the name Cassius mean?+
The name Cassius means “traditionally 'hollow, empty' (Latin 'cassus'); etymology debated” and is of Latin (Roman family name / nomen) origin.
What is the origin of the name Cassius?+
Cassius originates from Latin (Roman family name / nomen).
Is Cassius a popular name?+
Yes — see the popularity note above for how Cassius has trended in the US over time.
Cassius by gender
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Sources
- Behind the Name — Etymology and history of first names — Behind the Name
- US Social Security Administration — Popular baby names by year — Social Security Administration
- A Dictionary of First Names — Oxford Reference — Oxford University Press