| 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 |
|---|---|---|---|
| Obdulio | Comforts Others During Sorrow | Boy | 6 |
| Ociel | Sky | Boy | 8 |
| Octave | Eighth Child | Boy | 3 |
| Octavian | Born Eighth | Boy | 4 |
| Octavien | Eighth Child | Boy | 8 |
| Octavio | Eighth Child | Boy | 4 |
| Octavious | Eighth | Boy | 8 |
| Octavis | Eighth in Order | Boy | 8 |
| Octavius | Eighth Born | Boy | 2 |
| Octavus | Eighth Child | Boy | 2 |
| Odakota | Friend Sioux Friendly | Boy | 4 |
| Oetavian | Born Eighth | Boy | 6 |
| Oistin | Venerable Revered Majestic | Boy | 5 |
| Olethrus | Destruction | Boy | 1 |
| Oliver | Olive Tree, Elf Army | Boy | 9 |
| Oliverio | Peaceful, An Olive Tree | Boy | 6 |
| Olivero | An Olive Tree | Boy | 6 |
| Olivier | From the Olive Tree Elf Army | Boy | 9 |
| Oliviero | An Olive Tree | Boy | 6 |
| Olivo | Olive Tree | Boy | 1 |
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| Olley | An Olive Tree | Boy | 6 |
| Ollie | Olive Tree, Form of Oliver | Boy | 8 |
| Olliver | Peaceful An Olive Tree | Boy | 3 |
| Ollivor | An Olive Tree | Boy | 4 |
| Olvan | Peaceful | Boy | 1 |
| Omero | Security Pledge | Boy | 3 |
| Onesimus | Profitable Useful | Boy | 7 |
| Onofrio | Peace Peaceful Strength | Boy | 2 |
| Optato | Desired | Boy | 6 |
| Oratio | Timekeeper | Boy | 6 |
| Orazio | Timekeeper Has Good Eyesight | Boy | 3 |
| Orban | City-dweller Educated Man | Boy | 5 |
| Orcus | The Mythical Underworld | Boy | 4 |
| Orde | Beginning | Boy | 6 |
| Ordell | Beginning | Boy | 3 |
| Orel | Eagle Golden | Boy | 5 |
| Orien | The Orient, East | Boy | 7 |
| Oriol | Golden Oriole | Boy | 6 |
| Oriole | Golden A Gold Flecked Bird | Boy | 2 |
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| Orland | Renowned in the Land | Boy | 1 |
| Orlando | Renowned in the Land | Boy | 7 |
| Orleans | Golden | Boy | 3 |
| Orono | Pine Tree | Boy | 5 |
| Orris | Keeper of the Hours | Boy | 7 |
| Orry | From the Orient | Boy | 4 |
| Orsen | Bear Like Form of Orson | Boy | 8 |
| Orsini | Like a Bear | Boy | 3 |
| Orsino | Like a Bear | Boy | 9 |
| Orson | Bear Like Ormonds Son Like a | Boy | 9 |
| Osma | Protective Hero | Boy | 3 |
| Ossian | Young Deer Little Deer Dear | Boy | 5 |
| Ossin | Little Small Deer | Boy | 4 |
| Osten | Worthy of Respect Happy | Boy | 1 |
| Osvaldo | Divine Power God Power Rule | Boy | 7 |
| Otavio | Eighth | Boy | 1 |
| Otho | Wealthy | Boy | 4 |
| Ottavio | Eighth Born Eighth | Boy | 3 |
| Ovid | Worker She Woman Sheep Herder | Boy | 5 |
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