| Name | Meaning | Details |
|---|---|---|
| Onofre | Peace Warrior | View Details |
| Ophrah | Young Deer | View Details |
| Orah | From Ora. | View Details |
| Orlando | From Glorious Land | View Details |
| Orozco | From Orozco | View Details |
| Ortega | From Ortega | View Details |
| Ouida | Famous Warrior | View Details |
| Overton | From The Riverbank Town | View Details |
| Oxford | From The Oak Valley | View Details |
| Oya | Wind Warrior Goddess | View Details |
| Pacey | From Pacy In France | View Details |
| Paley | From The Pale Field | View Details |
| Palmer | Holy Land Pilgrim | View Details |
| Paris | From Paris | View Details |
| Patel | Land Owner | View Details |