| Baby Name | Meaning | Gender |
|---|
| Orion | Son Of Fire | Male |
| Orithyia | Myth Name | Female |
| Orpheus | Myth Name (Son Of Apollo) | Male |
| Osiris | Myth Name (God Of The Dead) | Male |
| Otho | Wealthy | Male |
| Palaemon | Myth Name (A Sea God) | Male |
| Paris | Myth Name (Son Of Priam) | Male |
| Parnell | Surname Derived From A Medieval Given Name. | Male |
| Parthenia | Chaste | Female |
| Pasiphae | Myth Name (Wife Of Minos) | Female |
| Patroclus | Myth Name (Achilles' Best Friend) | Male |
| Paula | Small | Female |
| Peleus | Myth Name (Father Of Achilles) | Male |
| Pelias | Myth Name (Son Of Poseidon) | Male |
| Pelopia | Myth Name (Mother Of Aegisthus) | Female |
| Penelope | Myth Name (Faithful Wife Of Odysseus) | Female |
| Peneus | Myth Name | Male |
| Penthesilea | Myth Name (A Queen Of The Amazons) | Female |
| Pentheus | Myth Name (A King Of Thebes) | Male |
| Percy | Pierce | Male |
| Perdix | Myth Name (Killed By His Uncle) | Male |
| Peregrine | The Peregrine Falcon Is The Bird Most Favored In The Ancient Sport Of Falconry. | Male |
| Persephone | Myth Name (Wife Of Hades) | Female |
| Persis | From Persia | Female |
| Phaedra | Myth Name (Daughter Of Minos) | Female |