Meanings of Names
O
| Name | Other variations | Origin | Meaning |
| Obadiah | Hebrew | Servant of Jehovah | |
| Octavius | Ocatvia(f), Tave, Tavy | Latin | The eighth born |
| Odette | Nordic | Feudal land | |
| Olaf | Nordic | After Saint Olaf | |
| Olga | Russian | Holy | |
| Olivia | Olive | Latin | An olive |
| Oliver | Noll, Nolly, Ollie | Latin | An olive tree |
| Olwen | Welsh | *folklore* white (trefoil) pathway | |
| Ophelia | Greek | Succor | |
| Orlando | Roland | Teutonic | Land famous |
| Orson | Latin | A bear | |
| Osbert | Old English | Light of God | |
| Oscar | Celtic | Bounding warrior | |
| Osmand | Osmund | Teutonic | Protection of God |
| Oswald | Teutonic | Power of God | |
| Otto | Teutonic | Rich | |
| Owen | Welsh | Young warrior |
