| Girl | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Boy | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Girl | ||||||||||||
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Boy | ||||||||||||
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Name | Meaning | Gender | Numerology |
|---|---|---|---|
| Obelix | Pillar of Strength | Boy | 4 |
| Obiareus | A Titan | Boy | 9 |
| Ocean | Titan who Rules Outer Sea | Boy | 2 |
| Oceanus | Father of the Oceanids | Boy | 6 |
| Ocnus | Incompetent | Boy | 9 |
| Octavius | Eighth Born | Boy | 2 |
| Odale | Of the valley | Boy | 1 |
| Odall | Rich Song | Boy | 8 |
| Odell | Otter, Wealthy, Song, Surname | Boy | 3 |
| Odessa | Filled with Wrath | Boy | 9 |
| Odie | Otter Song Rich | Boy | 6 |
| Odysseas | TBD | Boy | 8 |
| Odysseus | Wrathful, Angry Man | Boy | 1 |
| Oedipus | Swollen Foot | Boy | 8 |
| Oeneus | King of Calydon | Boy | 7 |
| Oenomaus | Son of Ares | Boy | 4 |
| Ohid | TBD | Boy | 9 |
| Oighrig | Well spoken | Boy | 1 |
| Olek | Defender of Man | Boy | 7 |
| Oleksander | Defender of Mankind | Boy | 5 |
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| Olethros | Destruction | Boy | 4 |
| Olimpiades | Mount Olympus | Boy | 4 |
| Olimpo | Sky | Boy | 8 |
| Ollie | Olive Tree, Form of Oliver | Boy | 8 |
| Olus | Protector of Man Defending Man | Boy | 4 |
| Olympiodoros | Gift of Olympos Olympus | Boy | 5 |
| Olympos | Home of the Gods | Boy | 7 |
| Olysseus | Full of Wrath | Boy | 9 |
| Omega | Last-born Child | Boy | 5 |
| Omero | Security Pledge | Boy | 3 |
| Omiros | TBD | Boy | 8 |
| Omma | Eye of Heaven The Sun | Boy | 6 |
| Ondrej | Manly, Brave, Strong, Masculine | Boy | 3 |
| Onesiforo | Bears Much Fruit | Boy | 8 |
| Onesimo | Useful Worthwhile | Boy | 9 |
| Onesimus | Profitable Useful | Boy | 7 |
| Onisimos | TBD | Boy | 5 |
| Ophion | A Serpent | Boy | 5 |
| Orane | Rising | Boy | 8 |
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| Orazio | Timekeeper Has Good Eyesight | Boy | 3 |
| Orcus | The Mythical Underworld | Boy | 4 |
| Oreias | From the Mountain | Boy | 4 |
| Orencio | Examining Judge | Boy | 7 |
| Orest | Mountain Dweller | Boy | 5 |
| Oreste | Man of the Mountain | Boy | 1 |
| Orestes | Man of the Mountain | Boy | 2 |
| Orestis | Brilliant | Boy | 6 |
| Orfeas | TBD | Boy | 1 |
| Orfeo | A Name from Ancient Mythology | Boy | 5 |
| Orian | Limit Boundary | Boy | 3 |
| Orien | The Orient, East | Boy | 7 |
| Origen | Mountain-born | Boy | 5 |
| Origenes | Mountain-born | Boy | 2 |
| Orin | White, Pale Green, Pale-skinned | Boy | 2 |
| Orion | Border or Extremity, Son of Fire | Boy | 8 |
| Orosco | Lives in the Mountains | Boy | 4 |
| Orpheus | Beautiful Voice, Son of Apollo | Boy | 3 |
| Orrin | The Name of an English River | Boy | 2 |
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| Ossa | Divine Law | Boy | 9 |
| Othello | Wealthy Prosperous Rich Youth | Boy | 6 |
| Otis | Rich, Son of Otto, Wealthy | Boy | 9 |
| Otos | Keen of Hearing | Boy | 6 |
| Ottis | Son of Otto, Son of the Wealthy | Boy | 2 |
| Otus | Keen of Hearing | Boy | 3 |
| Oulixes | Full of Wrath | Boy | 6 |
| Oulixeus | Full of Wrath | Boy | 9 |
| Ouranos | Air Sky Father Sky | Boy | 4 |
| Owain | Son of Urien, Well Born | Boy | 8 |
| Owen | Help from Allah, Well Born | Boy | 3 |
| Owin | Young Fighter Well Born | Boy | 7 |