Boy names that start with O
These 88 O boy names run from Oakley to Ozias, each with its meaning and origin. The most popular in the US in 2025 were Oliver, Owen and Oscar.
Octave
Eighth (Latin)
BoyFrench
Ola
Life, health (Hawaiian). No. 8,227 in the US in 2025, 13 babies.
UnisexHawaiian
Osborn
God bear (Old English). No. 11,645 in the US in 2025, 6 babies.
BoyEnglish
Odhrán
Little dun-colored one (Irish Gaelic). No. 13,366 in the US in 2025, 5 babies.
BoyIrish
Oriol
Golden (Latin)
BoySpanish
Oreste
Of the mountains (Greek)
BoyItalian
Ollin
Movement (Nahuatl). No. 6,067 in the US in 2025, 15 babies.
BoySpanish
Ori
My light (Hebrew). No. 2,002 in the US in 2025, 107 babies. Given to both: 29% girls.
UnisexHebrew
Osher
Happiness (Hebrew). No. 8,735 in the US in 2025, 9 babies.
UnisexHebrew
Olileanya
Hope, expectation (Igbo)
UnisexAfrican
Most popular boy names starting with O in 2025
Ranked by the number of US babies given each name. Each spelling is counted on its own.
| US rank | Name | Babies | 10-year trend | Meaning |
|---|---|---|---|---|
| #3 | Oliver | 14,939 | Rising | olive tree |
| #31 | Owen | 7,190 | Steady | anglicized form of Owain, possibly from Latin Eugenius |
| #223 | Oscar | 1,620 | Steady | possibly deer friend |
| #260 | Omar | 1,333 | Steady | long-lived, flourishing |
| #277 | Otto | 1,241 | Rising | wealth, fortune |
| #334 | Orion | 1,012 | Steady | – |
| #365 | Onyx | 881 | Steady | – |
| #454 | Oakley | 688 | Steady | oak clearing |
| #502 | Odin | 604 | Steady | frenzy, inspiration |
| #549 | Ozzy | 548 | Steady | – |
| #652 | Otis | 422 | Steady | wealth, fortune |
| #687 | Omari | 397 | Steady | – |
| #708 | Ozias | 381 | Rising | my power is Yahweh |
| #720 | Ocean | 375 | Rising | the great sea |
| #873 | Orlando | 275 | Steady | – |
| #997 | Oziel | 229 | Steady | – |
Source: US Social Security Administration baby-name data, 2025. Trend compares the rank with ten years earlier.
O names by the numbers
How many US babies get a name starting with O, counted from Social Security records of names given to at least 5 babies.
Boys
- Share of boys, 2025
- 2.2%
- Place among 26 letters
- 17th
- Different O names
- 243
- In the top 1,000
- 16
Share of boys with an O name: 0.3% in 1950, 0.7% in 2000, and 2.2% in 2025.
O boy names used in many cultures
Names our database lists in the most languages and countries, easy to spell and say in several of them.
- Oscarpossibly deer friend (Irish Gaelic)
- Oliverolive tree (Latin)
- Ottowealth, fortune (Germanic)
- Obadiahservant of God (Hebrew)
- Odinfrenzy, inspiration (Old Norse)
- Olivierolive tree (Latin)
- Osmundgod protector (Old English)
- Oswaldpower of a god (Old English)
- Owenanglicized form of Owain, possibly from Latin Eugenius (Welsh)
- Oakleyoak clearing (Old English)
- Oakleyoak clearing (Old English)
- Obedserving, worshipping (Hebrew)
- Obinnafather's heart (Igbo)
- Oceanthe great sea (Greek)
- Ocelotljaguar (Nahuatl)
- Ochiengborn when the sun shines (Luo)
- Octaveeighth (Latin)
- Octavianeighth (Latin)
Where these names come from
- Hebrew: 14
- Old English: 10
- Latin: 10
- Old Norse: 9
- Irish Gaelic: 6
- Yoruba: 6
- Luo: 4
- Turkish: 4
All 88 boy names that start with O
| Name | Meaning | Origin | Gender |
|---|---|---|---|
| Oakley | oak clearing | Old English | Boy |
| Oakley | oak clearing | Old English | Unisex |
| Obadiah | servant of God | Hebrew | Boy |
| Obed | serving, worshipping | Hebrew | Boy |
| Obinna | father's heart | Igbo | Boy |
| Ocean | the great sea | Greek | Unisex |
| Ocelotl | jaguar | Nahuatl | Boy |
| Ochieng | born when the sun shines | Luo | Boy |
| Octave | eighth | Latin | Boy |
| Octavian | eighth | Latin | Boy |
| Octavio | eighth | Latin | Boy |
| Octavius | eighth | Latin | Boy |
| Odd | point of a blade | Old Norse | Boy |
| Odhiambo | born in the evening | Luo | Boy |
| Odhrán | little dun-colored one | Irish Gaelic | Boy |
| Odin | frenzy, inspiration | Old Norse | Boy |
| Ofek | horizon | Hebrew | Boy |
| Ofer | fawn | Hebrew | Boy |
| Ofri | my fawn | Hebrew | Unisex |
| Oihan | forest | Basque | Boy |
| Oisín | little deer | Irish Gaelic | Boy |
| Oiva | splendid | Finnish | Boy |
| Ojas | vigor, vitality | Sanskrit | Boy |
| Okan | archer | Turkish | Boy |
| Okuhle | that which is beautiful or good | Zulu | Unisex |
| Ola | life, health | Hawaiian | Unisex |
| Olaf | ancestor's descendant | Old Norse | Boy |
| Olamide | my wealth has arrived | Yoruba | Boy |
| Olav | ancestor's descendant | Old Norse | Boy |
| Oleg | holy, blessed | Old Norse | Boy |
| Olileanya | hope, expectation | Igbo | Unisex |
| Oliver | olive tree | Latin | Boy |
| Olivier | olive tree | Latin | Boy |
| Ollie | olive tree | Latin | Boy |
| Ollin | movement | Nahuatl | Boy |
| Olof | ancestor's descendant | Old Norse | Boy |
| Olufemi | God loves me | Yoruba | Boy |
| Olumide | my lord has come | Yoruba | Boy |
| Olusegun | God is victorious | Yoruba | Boy |
| Oluwafemi | God loves me | Yoruba | Boy |
| Oluwaseun | we thank God | Yoruba | Unisex |
| Omar | long-lived, flourishing | Arabic | Boy |
| Omer | sheaf of grain | Hebrew | Boy |
| Ömer | long-lived, flourishing | Arabic | Boy |
| Omid | hope, expectation | Persian | Boy |
| Omondi | born at dawn | Luo | Boy |
| Ömür | life | Arabic | Unisex |
| Onni | happiness, luck | Finnish | Boy |
| Onur | honor, dignity | Turkish | Boy |
| Onyekachi | who is greater than God? | Igbo | Boy |
| Or | light | Hebrew | Unisex |
| Oran | little dun-colored one | Irish Gaelic | Boy |
| Orel | light of God | Hebrew | Boy |
| Oren | pine tree | Hebrew | Boy |
| Oreste | of the mountains | Greek | Boy |
| Orestis | of the mountains | Greek | Boy |
| Ori | my light | Hebrew | Unisex |
| Oriol | golden | Latin | Boy |
| Orm | serpent, dragon | Old Norse | Boy |
| Orson | little bear | Old French | Boy |
| Orvar | arrow | Old Norse | Boy |
| Osamu | to govern; to study (depends on characters) | Japanese | Boy |
| Osbert | God and bright | Old English | Boy |
| Osborn | god bear | Old English | Boy |
| Oscar | possibly deer friend | Irish Gaelic | Boy |
| Osher | happiness | Hebrew | Unisex |
| Osian | little deer | Irish Gaelic | Boy |
| Osip | he will add, a folk form of Joseph | Hebrew | Boy |
| Osman | baby bustard (a bird) | Arabic | Boy |
| Osmond | God and protection | Old English | Boy |
| Osmund | god protector | Old English | Boy |
| Osric | god ruler | Old English | Boy |
| Ossian | little deer | Irish Gaelic | Boy |
| Osvaldo | god's power | Old English | Boy |
| Oswald | power of a god | Old English | Boy |
| Oswin | god friend | Old English | Boy |
| Otávio | eighth | Latin | Boy |
| Otieno | born at night | Luo | Boy |
| Otis | wealth, fortune | Germanic | Boy |
| Ottar | dread warrior | Old Norse | Boy |
| Ottavio | the eighth | Latin | Boy |
| Otto | wealth, fortune | Germanic | Boy |
| Ottokar | German form of Odoacer, wealthy and vigilant | Germanic | Boy |
| Owen | anglicized form of Owain, possibly from Latin Eugenius | Welsh | Boy |
| Oz | strength | Hebrew | Boy |
| Ozan | bard, poet | Turkish | Boy |
| Özgür | free | Turkish | Unisex |
| Ozias | my power is Yahweh | Hebrew | Boy |
Frequently asked questions
What are the most popular boy names that start with O?
The most popular boy names starting with O in the US are Oliver (#3), Owen (#31), Oscar (#223), Omar (#260), Otto (#277), according to US Social Security Administration data for 2025.
How many boy names start with O?
In 2025, 243 different boy names starting with O were given to at least 5 US babies each, and 16 of them were in the top 1,000. This page lists 88 with their meaning and origin.
How common are boy names that start with O?
2.2% of US boys born in 2025 have a name starting with O, making it the 17th most common first letter. In 1950 it was 0.3%.
Where do boy names starting with O come from?
The most common origins on this list are Hebrew (14), Old English (10), Latin (10).