Boy Name · Latin Origin
Cassius
Cassius is a boy baby name of Latin origin, meaning "Empty, vain". It currently sits in the Rare tier of US baby names for 2026, and parents who love Cassius often also consider Cassian.
Cassius meaning, origin, and usage
Meaning: Empty, vain
Origin: Latin naming roots help connect Cassius to related Latin baby names.
Pronunciation: Baby Name Studio pronounces Cassius as C·A·S·S·I·U·S, with 7 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Cassius is an uncommon, standout choice in the Rare tier.
Cassius variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Cassiusa, Cassiuse, Cassiusy, Cassiu.
- Nicknames: Cass and C.
- Middle names: Pair Cassius with a middle name that balances its substantial sound; start with the Cassius middle name generator.
- Sibling names: Cassian, Columbus, Cleatus, Cornelius, Caesar — full picks on the sibling names for Cassius guide for a cohesive sibset.
- Similar names: Looking for names that sound like Cassius? Browse our names like Cassius guide for phonetic-neighbor picks.
- Explore more: use the Baby Name Explorer, name search, AI name generator, and Baby Name Studio homepage.
Frequently asked about Cassius
What does the name Cassius mean?
Cassius means "Empty, vain" and is of Latin origin.
What is the origin of Cassius?
Cassius originates in Latin naming tradition.
How do you pronounce Cassius?
Cassius has 7 letters and is most commonly stressed on the first syllable.
Is Cassius a boy's or girl's name?
Cassius is primarily used as a boy's name in US records.
How popular is Cassius in 2026?
In our 2026 popularity tracker, Cassius sits in the Rare tier — an uncommon, standout choice.
What names are similar to Cassius?
Names that share Cassius's sound and style include Cassian, Columbus, Cleatus, Cornelius, Caesar.
What middle names pair well with Cassius?
Good middle-name fits for Cassius pair an opposite syllable rhythm: if Cassius is short, lean longer (e.g. classical or three-syllable middles); if Cassius is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Cassius?
Sibling names that pair naturally with Cassius share its rhythm without rhyming — Cassian, Columbus, Cleatus all sit comfortably alongside it on a shortlist.