| Baby Name | Meaning | Gender |
|---|
| Oakley | From The Oak-Tree Meadow | Male |
| Oceanus | Myth Name (Father Of The Oceanids) | Male |
| Odanodan | Of The Red Earth | Male |
| Odele | Harmonious | Female |
| Odell | Wealthy | Male |
| Ogden | From The Oak-Tree Valley | Male |
| Olinda | Defender Of The Land | Female |
| Olive | Olive | Female |
| Onatah | Iroquois Name Meaning "Of The Earth." ONAWA | Female |
| Onslow | From The Zealous One's Hill | Male |
| Opal | Jewel PADMA | Female |
| Ophelia | Serpentine | Female |
| Ophrah | Fawn | Female |
| Orestes | From The Mountain | Male |
| Orford | From The Cattle Ford | Male |
| Orlando | Renowned In The Land. Form Of Roland. | Male |
| Ormond | Spear Defender | Male |
| Orpheus | Myth Name (Son Of Apollo) | Male |
| Orrick | From The Ancient Oak Tree | Male |
| Orton | From The Shore Farm | Male |
| Orville | From The Gold Town | Male |
| Owen | Young Fighter | Male |
| Oxford | From The Ox Ford | Male |
| Pansy | Flower | Female |
| Paris | Myth Name (Son Of Priam) | Male |