| Oria | Woman | Latin Names |
| Oriana | Woman | Latin Names |
| Orien | Unisex | Latin Names |
| Oriole | Unisex | Latin Names |
| Ova | Woman | Latin Names |
| Ovid | Man | Latin Names |
| Pacifica | Woman | Latin Names |
| Padgett | Man | Latin Names |
| Pasca | Woman | Latin Names |
| Paul | Man | Latin Names |
| Paula | Woman | Latin Names |
| Pax | Unisex | Latin Names |
| Pennsylvania | Unisex | Latin Names |
| Perdita | Woman | Latin Names |
| Peregrine | Unisex | Latin Names |
| Perenna | Woman | Latin Names |
| Perpetua | Woman | Latin Names |
| Petronella | Woman | Latin Names |
| Petula | Woman | Latin Names |
| Pieta | Woman | Latin Names |