Gender-Neutral Name · Greek Origin
Theo
Theo is a gender-neutral name whose meaning is not firmly attested in the historical record. It is a gender-neutral name of Greek origin, and it is rare in the United States today — outside the SSA top 1,000.
Origin and meaning: English Wiktionary (CC BY-SA 4.0). Popularity: US Social Security Administration.
Considering Theo? It is a neutral name, rooted in Greek naming tradition, and ranks in our Rare popularity tier. Phonetically it shares territory with Thea.
Theo meaning, origin, and usage
Meaning: Theo has a distinctive sound and evolving modern usage.
Origin: Greek naming roots help connect Theo to related Greek baby names.
Pronunciation: Baby Name Studio pronounces Theo as T·H·E·O, with 4 letters and a gender-neutral usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Theo is an uncommon, standout choice in the Rare tier.
Theo variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Theoa, Theoe, Theoy.
- Nicknames: Theo works as its own nickname.
- Middle names: Pair Theo with a middle name that balances its short sound; start with the Theo middle name generator.
- Sibling names: Thea, Teo, Thuy, Tia, Ty — full picks on the sibling names for Theo guide for a cohesive sibset.
- Similar names: Looking for names that sound like Theo? Browse our names like Theo 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 Theo
What does the name Theo mean?
Theo has no single meaning that is firmly attested in the historical record. It is used as a neutral name in US birth records, and parents usually choose it for its sound rather than a documented meaning.
What is the origin of Theo?
Theo originates in Greek naming tradition.
How do you pronounce Theo?
Theo has 4 letters and is most commonly stressed on the first syllable.
Is Theo a boy's or girl's name?
Theo is primarily used as a girl's name in US records.
How popular is Theo in 2026?
In our 2026 popularity tracker, Theo sits in the Rare tier — an uncommon, standout choice.
What names are similar to Theo?
Names that share Theo's sound and style include Thea, Teo, Thuy, Tia, Ty.
What middle names pair well with Theo?
Good middle-name fits for Theo pair an opposite syllable rhythm: if Theo is short, lean longer (e.g. classical or three-syllable middles); if Theo is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Theo?
Sibling names that pair naturally with Theo share its rhythm without rhyming — Thea, Teo, Thuy all sit comfortably alongside it on a shortlist.