| 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 |
|---|---|---|---|
| Oberon | Elf Ruler High-born and Bearlike | Boy | |
| Obert | Wealthy Bright | Boy | |
| Ocean | Titan who Rules Outer Sea | Boy | |
| Octa | TBD | Boy | |
| Octave | Eighth Child | Boy | |
| Octavian | Born Eighth | Boy | |
| Octavien | Eighth Child | Boy | |
| Octavio | Eighth Child | Boy | |
| Octavius | Eighth Born | Boy | |
| Octavus | Eighth Child | Boy | |
| Odalric | TBD | Boy | |
| Ode | Born on the Road | Boy | |
| Oded | Encourages Strong | Boy | |
| Odessa | Filled with Wrath | Boy | |
| Odil | Rich | Boy | |
| Odilo | Rich | Boy | |
| Odin | Inspiration, Wealthy Defender | Boy | |
| Odo | Name of a Bishop, Prosperous | Boy | |
| Odohr | Perfume Strong Smell | Boy | |
| Odon | Wealthy Defender Protector | Boy | |
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| Odwin | Noble Friend | Boy | |
| Ofer | Young Deer, Deer, Gold | Boy | |
| Ofir | Ferocious | Boy | |
| Oger | TBD | Boy | |
| Ohad | Praising Confessing United | Boy | |
| Ohel | Tent Tabernacle Brightness | Boy | |
| Okba | TBD | Boy | |
| Olan | Royal Forefather | Boy | |
| Oleg | Holy, Sacred, Blessed, Prosperous | Boy | |
| Olegario | Dominates with the Lance | Boy | |
| Olesya | TBD | Boy | |
| Olfa | Familiarity Intimacy | Boy | |
| Oliva | Olive Tree Olive | Boy | |
| Oliver | Olive Tree, Elf Army | Boy | |
| Oliverio | Peaceful, An Olive Tree | Boy | |
| Olivier | From the Olive Tree Elf Army | Boy | |
| Oliviero | An Olive Tree | Boy | |
| Olla | Precious | Boy | |
| Ollie | Diminutive of Oliver Olive tree | Boy | |
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| Olof | Ancestor Relic | Boy | |
| Oluf | Descendant | Boy | |
| Omar | An Era, The Highest | Boy | |
| Omer | Eloquent or Bundle of Grain | Boy | |
| Ommar | First Son | Boy | |
| Omont | TBD | Boy | |
| Omri | Sheaf of Corn Grain | Boy | |
| Onesimus | Profitable Useful | Boy | |
| Onfroi | Peace Peaceful Hun | Boy | |
| Onil | Wind | Boy | |
| Onille | From Gold Town | Boy | |
| Opie | TBD | Boy | |
| Orain | Most Celebrated | Boy | |
| Oram | From the Riverbank Enclosure | Boy | |
| Orane | Rising | Boy | |
| Orenga | TBD | Boy | |
| Oreste | Man of the Mountain | Boy | |
| Orhan | Army Commander | Boy | |
| Ori | Light of Mine, Charitable King | Boy | |
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| Oriel | Gold | Boy | |
| Orion | Border or Extremity, Son of Fire | Boy | |
| Orlando | Renowned in the Land | Boy | |
| Orleans | Golden | Boy | |
| Ormond | Spear Defender, Spear | Boy | |
| Ormonde | Mountain of Bears, Spear | Boy | |
| Ormondo | Army Man Form of Herman | Boy | |
| Orpheus | Beautiful Voice, Son of Apollo | Boy | |
| Orry | From the Orient | Boy | |
| Orso | Bear Cub | Boy | |
| Orson | Bear cub Famous Bearer American actordirector Orson Welles | Boy | |
| Orv | From the Town of Gold | Boy | |
| Orval | Golden Village, Spear Strength | Boy | |
| Orvell | From the Town of Gold | Boy | |
| Orvelle | Gold Town | Boy | |
| Orvil | Golden Village, Spear Strength | Boy | |
| Orville | Golden City Town Village | Boy | |
| Osbert | Divinely Brilliant God Bright | Boy | |
| Osborn | Divine Warrior, Bear of God | Boy | |
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| Osmar | Divinely Glorious | Boy | |
| Osmin | Godly Protection | Boy | |
| Osmond | Divine Protection God Protector | Boy | |
| Osvaldo | Divine Power God Power Rule | Boy | |
| Oswald | Divinely Powerful, Name of a King | Boy | |
| Otello | Forms of Otto Rich Prosperous | Boy | |
| Otmar | Great Famous | Boy | |
| Otniel | God is My Strength | Boy | |
| Otrmondo | French Form of Herman Army Man | Boy | |
| Ottavio | Eighth Born Eighth | Boy | |
| Ottewell | TBD | Boy | |
| Ottmar | Great Famous Servant of God | Boy | |
| Otto | Fortune, Born Eighth, Wealthy | Boy | |
| Oumar | TBD | Boy | |
| Ourson | Little Bear | Boy | |
| Ousama | Lion | Boy | |
| Ousman | TBD | Boy | |
| Ousmane | Divine Protector | Boy | |
| Oussama | TBD | Boy | |