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| Octavio | Variant of Octavius |
| Octavius | Octavius |
| Olek | Variant of Alexander |
| Oliver | Oliver |
| Olivier | Variant of Oliver |
| Oliviero | Variant of Oliver |
| Omar | Variant of Umar |
| Omari | Variant of Umar |
| Orion | Orion |
| Orlando | Variant of Roland |
| Oscar | Variant of Oskar |
| Oskar | Oskar |
| Osvaldo | Variant of Oswald |
| Oswald | Oswald |
| Oswaldo | Variant of Oswald |
| Otis | Otis |
| Owen | Owen |