| Name | Gender | Origin/Nationality | Name Meaning |
| Oakes | Boy | English | Oak tree |
| Oakley | Boy | English | Oak tree |
| Obadiah | Boy | Hebrew | Servant of the Lord |
| Obaid | Boy | Muslim, Arabic | Small Slave |
| Oceana | Girl | English | Ocean |
| Octavia | Girl | Latin | Eighth |
| Octavius | Boy | Latin | Eighth born |
| Odelette | Girl | French, Greek | Little song |
| Odelia | Girl | German | Wealthy |
| Odell | Boy | Norse | Man of property |
| Odette | Girl | Greek | Melody |
| Oditi | Girl | Hindu | dawn |
| Ogden | Boy | English | Oak tree valley |
| Ojayit | Boy | Hindu | courageous |
| Okely | Boy | English | Oak tree meadow |
| Olaf | Boy | Norse | Relic |
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