Girl Name
Casi
Casi is a girl's name whose meaning is not firmly attested in the historical record. It is used as a girl's name across several naming traditions, and it is rare in the United States today — outside the SSA top 1,000.
Casi is a girl baby name. It currently sits in the Rare tier of US baby names for 2026, and parents who love Casi often also consider Cassi.
Casi meaning, origin, and usage
Meaning: Casi has a distinctive sound and evolving modern usage.
Origin: Multiple naming traditions are associated with this name.
Pronunciation: Baby Name Studio pronounces Casi as C·A·S·I, with 4 letters and a girl usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Casi is an uncommon, standout choice in the Rare tier.
Casi variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Casia, Casie, Casiy.
- Nicknames: Casi works as its own nickname.
- Middle names: Pair Casi with a middle name that balances its short sound; start with the Casi middle name generator.
- Sibling names: Cassi, Case, Cash, Casey, Casie — full picks on the sibling names for Casi guide for a cohesive sibset.
- Similar names: Looking for names that sound like Casi? Browse our names like Casi 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 Casi
What does the name Casi mean?
Casi has no single meaning that is firmly attested in the historical record. It is used as a girl name in US birth records, and parents usually choose it for its sound rather than a documented meaning.
What is the origin of Casi?
The exact origin of Casi is debated, but it has been used across multiple naming traditions.
How do you pronounce Casi?
Casi has 4 letters and is most commonly stressed on the first syllable.
Is Casi a boy's or girl's name?
Casi is primarily used as a girl's name in US records.
How popular is Casi in 2026?
In our 2026 popularity tracker, Casi sits in the Rare tier — an uncommon, standout choice.
What names are similar to Casi?
Names that share Casi's sound and style include Cassi, Case, Cash, Casey, Casie.
What middle names pair well with Casi?
Good middle-name fits for Casi pair an opposite syllable rhythm: if Casi is short, lean longer (e.g. classical or three-syllable middles); if Casi is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Casi?
Sibling names that pair naturally with Casi share its rhythm without rhyming — Cassi, Case, Cash all sit comfortably alongside it on a shortlist.