| 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 |
|---|---|---|---|
| Oach | Keen Ear Big Ear | Girl | 9 |
| Obharnait | Little green one | Girl | 7 |
| Obharnait | Colour of Olive | Girl | 7 |
| Odarnait | Small Pale One | Girl | 1 |
| Odhamnait | Swallow Dun | Girl | 4 |
| Odharnait | Pale Little Swallow One | Girl | 9 |
| Ohnicio | Honor | Girl | 1 |
| Ohnicio | Honour | Girl | 1 |
| Oilbhe | Olive | Girl | 6 |
| Oilbhe | Olive | Girl | 6 |
| Oistin | Venerable | Girl | 5 |
| Olive | Olive tree | Girl | 9 |
| Olive | Kind One Tree Peace Pure | Girl | 9 |
| Olivia | Symbol of Peace, Olive Tree | Girl | 5 |
| Olly | Blessed Holy | Girl | 1 |
| Oma | Little green one | Girl | 2 |
| Omat | Little green one | Girl | 4 |
| Omat | Colour of Olive | Girl | 4 |
| Ona | One | Girl | 3 |
| Ona | Full of Grace, Fire, Grace | Girl | 3 |
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| Onora | Woman of Honour Honour | Girl | 9 |
| Oona | One | Girl | 9 |
| Oona | Unity Pure United | Girl | 9 |
| Oonagh | One | Girl | 6 |
| Oonagh | Pure Lamb One Unity | Girl | 6 |
| Oran | Sorrowful Saint Green Queen | Girl | 3 |
| Orfhlaith | Gold Princess | Girl | 7 |
| Orflath | Gold Princess Lady | Girl | 8 |
| Orghlaith | Golden | Girl | 8 |
| Orghlaith | Golden | Girl | 8 |
| Oriella | Golden | Girl | 9 |
| Orinthia | Fair Pale Pine Tree | Girl | 4 |
| Orla | Golden lady | Girl | 1 |
| Orla | Princess of Gold Golden Princess | Girl | 1 |
| Orlagh | Golden Queen Princess | Girl | 7 |
| Orlaith | Golden Princess | Girl | 2 |
| Orlaith | Golden lady | Girl | 2 |
| Orlaithe | Golden | Girl | 7 |
| Orlaithe | Golden lady | Girl | 7 |
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| Ornat | Small Pale One | Girl | 5 |
| Ornora | Honour | Girl | 9 |
| Oshea | Child of Shea | Girl | 3 |
| Osmanna | Name of a Saint | Girl | 5 |
| Osnait | Deer | Girl | 6 |
| Osnit | Deer | Girl | 5 |
| Ownah | One Unity Form of Una | Girl | 7 |