| Gender | Baby Name | Meaning |
|---|---|---|
 | Oliva | Olive |
| Olivia | Olive tree |
 | Orrick | Sword ruler |
| Orson | Bear cub |
| Osbert | Divine bright |
| Owen | Well born |
| Pacey | From Pacy in France |
| Paige | Assistant |
| Palmer | Holy land pilgrim |
| Pamela | All honey |
| Parker | Park keeper |
| Parkin | Rock |
| Parrish | Noble from Paris |
| Parry | Son of Harry |
| Pascal | Child of Easter |
| Patricia | Noble |
| Patrick | Noble |
| Patsy | Noble |
| Patty | Noble |
| Peg | Pearl |
| Peggy | Pearl |
| Penney | Duck |
| Petronella | Rock |
| Phyllida | Green leaves |
| Pierce | Rock |
| Pippa | Lover of horses |
| Polly | Great sorrow |
| Porter | Doorkeeper |
| Potter | Pot maker |
| Queenie | Queen |
