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| NAME | GENDER | ORIGIN | MEANING |
| Oakes | | Old English | The Oak |
| Oakley | | Old English | Grove of an Oak Tree |
| Obadiah | | Hebrew | Servant of the Lord |
| Octavia | | Latin | Eighth |
| Octavius | | Latin | Eighth Born |
| Odelette | | French-Greek | Little Song |
| Odelia | | Teutonic | Wealthy |
| Odell | | Norse | Man of Property |
| Odette | | Greek | Melody |
| Ogden | | Old English | Residence Name |
| Olaf | | Old Norse | Relic |
| Olethea | | Latin | Truth |
| Olga | | Teutonic | Holy |
| Olin | | Middle English | Holly |
| Oliver | | Latin | Olive Tree |
| Olivia | | Latin | Symbol of Peace |
| Olympia | | Greek | Home of the Gods |
| Omar | | Arabic | First Born |
| Ophelia | | Greek | Serpent |
| Oprah | | Hebrew | Fawn |
| Ora | | Latin | Seacoast |
| Oralie | | Latin | The Golden |
| Oren | | Hebrew | Cedar Tree |
| Oriana | | Latin | Golden One |
| Oribel | | Latin | Golden Beauty |
| Oriel | | Old French-Latin | The Golden |
| Orlando | | Teutonic | Fame of the Land |
| Orlena | | Latin | The Golden |
| Orson | | Latin | Like the Bear |
| Orton | | Teutonic | Wealthy |
| Orva | | Anglo Saxon | Courageous Friend |
| Orvin | | Anglo Saxon | Boar Friend |
| Osborn | | Old English | Soldier of God |
| Oscar | | Scandinavian | Spear of God |
| Osgood | | Teutonic | Divine Creator |
| Osmond | | Teutonic | Under Divine Protection |
| Oswald | | Teutonic | Of God-Like Power |
| Otis | | Greek | Hears Well |
| Otto | | Teutonic | Prosperous |
| Owen | | Welsh | Well-Born |
| Oxford | | English | River's Pass |
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