Baby Boy Names - Letter O
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| Name | Meaning | Gender | Origin |
| Oakes | The Oak | Boy | Old English |
| Oakley | Grove of an Oak Tree | Boy | Old English |
| Obadiah | Servant of the Lord | Boy | Hebrew |
| Obedience | To Obey | Boy Or Girl | American |
| Oberon | Bear Heart | Boy Or Girl | German |
| Obert | Wealthy | Boy Or Girl | German |
| Octavio | The Eighth | Boy | Latin |
| Octavious | Eighth | Boy | Latin |
| Octavius | Eighth Born | Boy | Latin |
| Odakota | Friend | Boy | Native American |
| Oded | Strong | Boy | Hebrew |
| Odell | Man of Property | Boy | Norse |
| Odin | Supreme God | Boy Or Girl | Scandinavian |
| Odysseus | Full Of Wrath | Boy | Greek |
| Ogden | Residence Name | Boy | Old English |
| Ohanzee | Shadow | Boy | Native American |
| Ohio | Large River | Boy Or Girl | Native American |
| Oistin | Venerable | Boy Or Girl | Latin |
| Okal | To Cross | Boy Or Girl | African |
| Okapi | Animal With Long Neck | Boy Or Girl | African |
| Oke | Form Of Oscar | Boy Or Girl | Hawaiian |
| Okoth | Born When It Was Raining | Boy Or Girl | African |
| Olaf | Relic | Boy | Old Norse |
| Oleg | Sacred | Boy | Slavic |
| Olin | Holly | Boy | Middle English |
| Oliver | Olive Tree | Boy | Latin |
| Ollie | From The Name Oliver | Boy | Greek |
| Oma | Commander | Boy | Arabic |
| Omar | First Born | Boy | Arabic |
| Omega | Last | Boy Or Girl | Greek |
| On | Peace | Boy | Chinese |
| Onan | Wealthy | Boy | Turkish |
| Onofre | Defender Of Peace | Boy | Spanish |
| Onslow | Hill Of The Passionate One | Boy | Arabic |
| Oral | Speaker, Word | Boy | Latin |
| Oran | Green | Boy Or Girl | Celtic/Gaelic |
| Orane | Rising | Boy Or Girl | Greek |
| Orde | Beginning | Boy Or Girl | Latin |
| Ordell | Beginning | Boy Or Girl | Latin |
| Oren | Cedar Tree | Boy | Hebrew |
| Orestes | Mountain Man | Boy | Greek |
| Orien | The Orient, East | Boy Or Girl | Latin |
| Oringo | He Who Likes The Hunt | Boy | African |
| Oriole | Golden; A Gold Flecked Bird | Boy Or Girl | Latin |
| Orion | A Hunter In Greek Mythology | Boy Or Girl | Greek |
| Orlando | Land Of Gold | Boy | Spanish |
| Orlando, Orland | Fame of the Land | Boy | Germanic |
| Orleans | Golden | Boy Or Girl | French |
| Orly | Light | Boy Or Girl | Hebrew |
| Ormand | Serpent | Boy | German |
| Ornice | Cedar Tree | Boy | Hebrew |
| Oro | Gold | Boy | Spanish |
| Orrick | Venerable Oak | Boy | English |
| Orrin | River | Boy | English |
| Orsen | From The Name Orson | Boy | Latin |
| Orsin | Bear | Boy | Latin |
| Orson | Like the Bear | Boy | Latin |
| Orton | Wealthy | Boy | Germanic |
| Orville | Golden City | Boy | French |
| Orvin | Boar Friend | Boy | Anglo Saxon |
| Osama | Lion-Like | Boy | Arabic |
| Osborn | Divine Bear | Boy | Germanic |
| Osborn | Soldier of God | Boy | Old English |
| Osbourne | Born From A Bear | Boy | Scandinavian |
| Oscar | Spear of God | Boy | Scandinavian |
| Osgood | Divine Creator | Boy | Germanic |
| Osias | Salvation | Boy | Greek |
| Osman | Tender Youth | Boy | Arabic |
| Osmond | Under Divine Protection | Boy | Germanic |
| Osric | Divine Ruler | Boy | English |
| Ossie | God'S Divine Power | Boy | English |
| Oswald | Of God-Like Power | Boy | Germanic |
| Othello | Prosperous | Boy | Greek |
| Otieno | Born At Night | Boy | African |
| Otis | Hears Well | Boy | Greek |
| Otto | Prosperous | Boy | Germanic |
| Overton | The Upper Town | Boy Or Girl | English |
| Ovid | Egg Shaped | Boy | Latin |
| Ovidio | Shepherd | Boy | Spanish |
| Owen | Well-Born | Boy | Welsh |
| Oxford | River's Pass | Boy | English |
| Oya | To Beckon | Boy Or Girl | Native American |
| Oz | Strength | Boy Or Girl | Hebrew |
| Ozzie | God'S Divine Power | Boy | English |
| Ozzy | God'S Divine Power | Boy | English |
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Browse Baby Boy Names By First Letter
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