| Name | Meaning | Details |
|---|---|---|
| Onyekachukwu | Who Is Greater Than God? | View Details |
| Orah | From Ora. | View Details |
| Orlando | From Glorious Land | View Details |
| Orozco | From Orozco | View Details |
| Ortega | From Ortega | View Details |
| Osbert | God Bright | View Details |
| Osborn | God Bear | View Details |
| Osbourne | God Bear | View Details |
| Osgood | God Goth | View Details |
| Osiris | God Of The Dead | View Details |
| Osmond | God Protector | View Details |
| Osric | God Ruler | View Details |
| Osvaldo | God Rule | View Details |
| Oswald | God Rule | View Details |
| Oswaldo | God Rule | View Details |