| Name | Meaning | Details |
|---|---|---|
| Orlaith | Gold Queen | View Details |
| Orlando | From Glorious Land | View Details |
| Orleans | Golden | View Details |
| Orlena | Golden | View Details |
| Ormand | Descendent Of The Red One | View Details |
| Ormanda | Descendent Of The Red One | View Details |
| Oro | Gold | 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 |
| Oxford | From The Oak Valley | View Details |