Cassius

A distinctive pick — fewer than 34 pets share this name.

#2621

Meaning & Story

Cassius is a Latin name from the ancient Roman family name Cassius, derived from a root possibly meaning 'hollow' or 'empty.' It was borne by Gaius Cassius Longinus, one of Julius Caesar's assassins, and by the great Muhammad Ali, born Cassius Clay, who transformed the name into a symbol of beauty, confidence, and athletic genius.

Cassius is a magnificent, heavyweight pet name with the ringing confidence of a boxing legend. Muhammad Ali made Cassius a name synonymous with grace, power, and the absolute certainty of one's own worth — qualities that translate beautifully to a companion who carries himself with natural authority. Cassius suits a powerful, beautifully built dog who moves with athletic precision, or any companion whose presence is simply impossible to ignore. Float like a butterfly, sting like a bee.

At a Glance

#2621
Overall Rank
34
Registered
Boys
Popular With

Cassius's Personality

Cassius is a popular pet name with 34 registered pets. View the breed table above for matches.

Frequently Asked Questions

Is Cassius a good pet name?

Cassius is a well-known pet name with 34 registered pets.

Is Cassius a boy or girl pet name?

Cassius is more commonly given to male pets, though it can be used for any pet.

Is Cassius also a human name?

Yes! Cassius is both a popular pet name (ranked #2621 for pets) and a baby name. It is one of 1,600+ names shared between pets and humans on NamesPop.

Cassius has two lives

Cassius, the baby name
#567boys
9,230 babies
View baby page →
Cassius, the pet name
#2621pet name
34 pets
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Last updated May 2026 · Data: NYC & Seattle pet licensing records · Methodology