Boy Name
Casimiro
Casimiro is a boy's name whose meaning is not firmly attested in the historical record. It is used as a boy's name across several naming traditions, and it is rare in the United States today — outside the SSA top 1,000.
Casimiro — a boy name — is an uncommon, standout choice. If Casimer is on your shortlist, Casimiro belongs in the same conversation.
Casimiro meaning, origin, and usage
Meaning: Casimiro has a distinctive sound and evolving modern usage.
Origin: Multiple naming traditions are associated with this name.
Pronunciation: Baby Name Studio pronounces Casimiro as C·A·S·I·M·I·R·O, with 8 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Casimiro is an uncommon, standout choice in the Rare tier.
Casimiro variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Casimiroa, Casimiroe, Casimiroy, Casimir.
- Nicknames: Casi and C.
- Middle names: Pair Casimiro with a middle name that balances its substantial sound; start with the Casimiro middle name generator.
- Sibling names: Casimer, Casimir, Casondra, Cassian, Cassaundra — full picks on the sibling names for Casimiro guide for a cohesive sibset.
- Similar names: Looking for names that sound like Casimiro? Browse our names like Casimiro 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 Casimiro
What does the name Casimiro mean?
Casimiro has no single meaning that is firmly attested in the historical record. It is used as a boy name in US birth records, and parents usually choose it for its sound rather than a documented meaning.
What is the origin of Casimiro?
The exact origin of Casimiro is debated, but it has been used across multiple naming traditions.
How do you pronounce Casimiro?
Casimiro has 8 letters and is most commonly stressed on the first syllable.
Is Casimiro a boy's or girl's name?
Casimiro is primarily used as a boy's name in US records.
How popular is Casimiro in 2026?
In our 2026 popularity tracker, Casimiro sits in the Rare tier — an uncommon, standout choice.
What names are similar to Casimiro?
Names that share Casimiro's sound and style include Casimer, Casimir, Casondra, Cassian, Cassaundra.
What middle names pair well with Casimiro?
Good middle-name fits for Casimiro pair an opposite syllable rhythm: if Casimiro is short, lean longer (e.g. classical or three-syllable middles); if Casimiro is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Casimiro?
Sibling names that pair naturally with Casimiro share its rhythm without rhyming — Casimer, Casimir, Casondra all sit comfortably alongside it on a shortlist.