Baby names starting with O
| Name | Meaning | Gender |
|---|---|---|
| O'brian | Surname. | |
| O'brien | Surname. | |
| O'keefe | Surname. | |
| O'shay | Surname. | |
| O'shea | Surname. | |
| Oakden | From the oak tree valley | |
| Oakes | From the oak | |
| Oakley | From the oak - tree meadow | |
| Obadiah | Servant of jehovah | |
| Obed | Serving God | |
| Obediah | Serves God | |
| Obert | Wealthy, Brilliant | |
| Obharnait | The color of olive | |
| Ocelfa | From the high plain | |
| Octave | Born eighth | |
| Octavia | ||
| Octe | A son of Hengist | |
| Octha | Enemy of Arthur | |
| Ocumwhowurst | Yellow wolf (Cheyenne) | |
| Ocunnowhurst | Yellow wolf (Cheyenne) | |
| Ocvran | Father of Guinevere | |
| Oda | Elfin spear | |
| Odahingum | Rippling water (Chippewa) | |
| Odakota | Friend (Sioux) | |
| Odale | Of the valley | |
| Odam | Son in law | |
| Odanda | Famous land | |
| Odanodan | Of the red earth | |
| Odayle | Of the valley | |
| Odbart | Wealthy | |
| Oded | Encourages | |
| Odeda | Strong | |
| Odede | Strong | |
| Odel | Wealthy | |
| Odeletta | Little spring | |
| Odelette | Little spring | |
| Odelia | Little wealthy one | |
| Odelina | Little wealthy one; Elfin spear | |
| Odelinda | Little wealthy one | |
| Odell | Wealthy | |
| Odella | Little wealthy one | |
| Odelyn | Little wealthy one | |
| Odelyna | Little wealthy one | |
| Odette | Little wealthy one; Elfin spear | |
| Odhert | Wealthy | |
| Odhran | Pale green | |
| Odi | Wealthy defender | |
| Odiana | Elfin spear | |
| Odiane | Elfin spear | |
| Odila | Wealthy; Elfin spear | |
| Odile | Wealthy; Elfin spear | |
| Odilia | Little wealthy one | |
| Odin | Wealthy defender | |
| Odo | Name of a bishop | |
| Odom | Son in law | |
| Odon | Wealthy defender | |
| Odran | Pale green | |
| Odwolf | Wealthy wolf | |
| Odwolfe | Wealthy wolf | |
| Odwulf | Wealthy wolf | |
| Ody | Wealthy defender | |
| Oegelsby | Fearsome | |
| Oengus | One vigor | |
| Ofer | Fawn | |
| Offa | Name of a king | |
| Ofra | Fawn | |
| Ogaleesha | Wears a red shirt (Sioux) | |
| Ogden | From the oak tree valley | |
| Ogdon | From the oak tree valley | |
| Ogelsby | Fearsome | |
| Ogelsvie | Fearsome | |
| Ogelsvy | Fearsome | |
| Ogilhinn | From the high peak | |
| Ogilvie | From the high peak | |
| Ogin | Wild rose | |
| Ohanko | Reckless | |
| Ohanzee | Shadow (Sioux) | |
| Ohcumgache | Little wolf (Cheyenne) | |
| Ohitekah | Brave (Sioux) | |
| Ohnicio | Honor |