| 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 |
|---|---|---|---|
| Obrian | Surname | Boy | 5 |
| Obrien | Surname | Boy | 9 |
| Ockan | Brown Horse Horse Lover | Boy | 8 |
| Ockey | Horseman | Boy | 5 |
| Ockvilly | Horse Soldier | Boy | 1 |
| Odanodan | Of the red earth | Boy | 5 |
| Odanodan | Of the Red Earth | Boy | 5 |
| Odell | Otter | Boy | 3 |
| Odell | Otter, Wealthy, Song, Surname | Boy | 3 |
| Odhar | Grey Brown Dark | Boy | 1 |
| Odhran | Pale green | Boy | 6 |
| Odhran | Little Pale Green | Boy | 6 |
| Odran | Pale green | Boy | 7 |
| Odran | Pale Pale Green | Boy | 7 |
| Oengus | One vigor | Boy | 9 |
| Oengus | Dream, Swan, One Vigour | Boy | 9 |
| Oengusa | Chosen One Unique Choice | Boy | 1 |
| Oglesby | Awe-inspiring | Boy | 4 |
| Oilibhear | Relic Heir to his Ancestors | Boy | 7 |
| Oilleog | A Sprite Elf | Boy | 3 |
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| Oison | A Deer | Boy | 9 |
| Oissene | A Deer | Boy | 5 |
| Oissine | A Deer | Boy | 9 |
| Oistin | Majestic | Boy | 5 |
| Oistin | Venerable Revered Majestic | Boy | 5 |
| Okeefe | Surname | Boy | 2 |
| Olave | Ancestral Heritage Relic | Boy | 1 |
| Olchobar | Rulers Name | Boy | 2 |
| Olibhear | Seller Processor of Olive Oil | Boy | 7 |
| Olin | Holly Ancestor Hallowed | Boy | 5 |
| Oliver | Olive Tree, Elf Army | Boy | 9 |
| Onan | Wealthy | Boy | 8 |
| Onchu | Fierce Hound | Boy | 7 |
| ONeil | Son of Neil | Boy | 1 |
| Oney | Honourable | Boy | 5 |
| Oonan | Strength Power | Boy | 5 |
| Oral | Eagle Golden | Boy | 1 |
| Oran | Pale green | Boy | 3 |
| Oran | Little Pale Green One, Green | Boy | 3 |
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| Ormand | Red, Spear-man, Mountain of Bears | Boy | 2 |
| Ormond | Spear Defender, Spear | Boy | 7 |
| Ormonde | Mountain of Bears, Spear | Boy | 3 |
| Ornait | Ulster Battler | Boy | 5 |
| Orran | The Name of an English River | Boy | 3 |
| Orren | The Name of an English River | Boy | 7 |
| Orrin | The Name of an English River | Boy | 2 |
| Orthanach | Potent | Boy | 7 |
| Oscar | Friend of the Deer Gods Spear | Boy | 2 |
| Osgar | God Spear Gentle Friend | Boy | 6 |
| Osgur | Divine Spear, Dear Friend | Boy | 8 |
| Oshane | Son of Shea | Boy | 8 |
| Oshay | Surname | Boy | 5 |
| Oshe | Son of Shea | Boy | 2 |
| Oshea | A Saviour Deliverer | Boy | 3 |
| Osheen | Young Deer | Boy | 3 |
| Ossan | Little Deer | Boy | 5 |
| Ossian | Young Deer Little Deer Dear | Boy | 5 |
| Ossian | Fawn | Boy | 5 |
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| Ounam | Little Adam | Boy | 1 |
| Owen | Help from Allah, Well Born | Boy | 3 |
| Owney | Green Elderly | Boy | 1 |
| Ownry | Ruler of the State | Boy | 5 |
