| Name | Meaning | Details |
|---|---|---|
| Oceana | From The Sea | View Details |
| Oceanus | Of The Ocean | View Details |
| Ochoa | The Wolf | View Details |
| Ochola | Father Died While Mother Was Pregnant | View Details |
| Odahingum | Ripple In The Water | View Details |
| Odell | From The Woad Hill | View Details |
| Ogden | From The Oak Valley | View Details |
| Oihane | From The Forest | View Details |
| Okalani | Of The Heavens | View Details |
| Olimpio | Mountain Of The Gods | View Details |
| Olive | Olive Or From The Olive Tree | View Details |
| Oliver | Descendant Of The Ancestor | View Details |
| Oluina | From The Family Of My Mother | View Details |
| Olympia | Mountain Of The Gods | View Details |
| Omega | The Greek Letter | View Details |