baby names starting with O
Explore 29 baby names beginning with O. Each includes meaning, origin, pronunciation, and popularity data from the SSA.
baby names starting with O at a glance
- Names
- 29
- Girls · Boys · Unisex
- 12 · 12 · 5
- Top origin
- Greek
- Most popular (2025)
- Olivia #1
Our directory has 29 baby names starting with O: 12 girls' names, 12 boys' names and 5 unisex names.
In the 2025 Social Security rankings, the most popular is Olivia (#1 for girls), followed by Oliver (#3 for boys), Owen (#31 for boys) and Oakley (#156). 15 of them ranked in the US top 1,000 that year.
The most common origins are Greek (6), Latin (5) and African (4).
Onyx has climbed fastest, from #613 in 2020 to #365 in 2025; Opal rose from #649 to #423 over 5 years.
For something less common, Oak, Obiageli and Oisin were not in the US top 1,000 in any year from 2020 to 2025.
They average 5.4 letters, from Oak to Odysseus, and 52% have two syllables.
Most popular in 2025
- OakSturdy oak tree, strength and enduranceEnglish · unisex
- OakleyMeadow or clearing of oak treesEnglish · unisex#156
- Obiheart, mindAfrican · boy
- Obiagelione who has come to enjoy wealthAfrican · girl
- OceanThe great sea, vast expanse of waterGreek · unisex#720
- OctaviaeighthLatin · girl#308
- OctavianeighthLatin · boy
- Odettewealth, fortuneFrench · girl#883
- Odysseuswrathful, man of pain and cunningGreek · boy
- Oisinlittle deerIrish · boy
- OliveOlive tree, symbol of peaceLatin · girl#197
- Oliverolive tree, peaceLatin · boy#3
- Oliviaolive tree, peaceLatin · girl#1
- Oliwiaolive tree, symbol of peacePolish · girl
- OlufemiGod loves meAfrican · boy
- Olympiaof Mount OlympusGreek · girl
- Omarflourishing, long-livedArabic · boy#260
- Omotolaa child is worth as much as wealthAfrican · girl
- Onyxblack gemstone, clawGreek · unisex#365
- OpalPrecious gemstone, jewelSanskrit · girl#423
- OpheliaHelp, aid, or benefitGreek · girl#264
- OrianLight, or variant of the hunter OrionHebrew · unisex
- Orionrising in the sky, hunterGreek · boy#334
- Oritlight, my lightHebrew · girl
- OrlaGolden princess or golden queenIrish · girl
- Oscardeer friend, or god's spearIrish · boy#223
- OttoWealth, prosperity, or fortuneGerman · boy#277
- OwenYoung warrior, or well-bornWelsh · boy#31
- Ozanbard, minstrel, poet-singerTurkish · boy
questions about baby names starting with O
Which baby names starting with O are the most popular in 2025?
Based on the 2025 Social Security data, the most popular baby names starting with O are Olivia (#1 for girls), Oliver (#3 for boys), Owen (#31 for boys), Oakley (#156) and Olive (#197 for girls).
Which baby names starting with O are rising in popularity?
Onyx has climbed from #613 in 2020 to #365 in 2025. Opal (#649 to #423) and Oakley (#284 to #156) are also rising.
What are some unique baby names starting with O?
Oak, Obiageli, Oisin, Olympia and Orit were not in the US top 1,000 in any year from 2020 to 2025, so they stay distinctive while still carrying real meaning and history.
Are baby names starting with O more common for girls or boys?
Of 29 baby names starting with O on HushName, 12 are girls' names, 12 are boys' names and 5 are unisex.
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