| Name | Meaning | Details |
|---|---|---|
| Onslow | Hill Of The Passionate One | View Details |
| Ooko | Born Outside The Hospital | View Details |
| Orah | From Ora. | View Details |
| Orien | The Orient | View Details |
| Oringo | He Who Likes The Hunt | View Details |
| Orlando | From Glorious Land | View Details |
| Ormand | Descendent Of The Red One | View Details |
| Ormanda | Descendent Of The Red One | View Details |
| Orozco | From Orozco | View Details |
| Ortega | From Ortega | View Details |
| Orville | Golden Town | View Details |
| Oscosh | The Bravest Of All | View Details |
| Osiris | God Of The Dead | View Details |
| Overton | From The Riverbank Town | View Details |
| Owen | The Yew Tree Or Youth | View Details |