| Name | M/F | Meaning |
|---|---|---|
| Oach | ![]() |
Meaning : Keen-ear Or Big-ear Used in : Irish |
| Obharnait | ![]() |
Meaning : The Color Of Olive Used in : Irish |
| Odarnait | ![]() |
Meaning : Small Or Pale One Used in : Irish |
| Odhamnait | ![]() |
Meaning : Dun, Swallow Used in : Irish |
| Odharnait | ![]() |
Meaning : Little Swallow One, Pale Used in : Gaelic, Irish |
| Ohnicio | ![]() |
Meaning : Honor Used in : Irish |
| Oilbhe | ![]() |
Meaning : Olive Used in : Irish |
| Oistin | ![]() |
Meaning : Venerable Used in : Hindu, Irish, Irish, Latin |
| Olive | ![]() |
Meaning : Olive Used in : Australian, English, French, German, Irish, Jamaican, Italian, Latin, American, Australian, Chinese, British, Danish |
| Oma | ![]() |
Meaning : The Color Of Olive Used in : Hindu, Irish, Latin, American, Arabic, Hebrew, Sanskrit, Dutch, Gujarati |
| Omat | ![]() |
Meaning : The Color Of Olive Used in : Irish |
| Ona | ![]() |
Meaning : One, Together Used in : French, Irish, Latin, British, English, American, African, Australian, Hebrew, Danish |
| Onora | ![]() |
Meaning : Honor Used in : Irish, Latin |
| Oona | ![]() |
Meaning : One, Unity. Used in : Finnish, Greek, Irish, Latin |
| Oonagh | ![]() |
Meaning : Lamb, One, Unity Used in : Greek, Irish, Latin |
| Oran | ![]() |
Meaning : Sorrowful, Sorrow, Saint Used in : American, Hawaiian, Australian, Hebrew, Irish, British, Celtic, English, Gaelic, Irish |
| Orfhlaith | ![]() |
Meaning : Gold-princess Used in : Irish |
| Orflath | ![]() |
Meaning : Gold-princess, Gold-lady Used in : Irish |
| Orghlaith | ![]() |
Meaning : Golden Used in : Irish |
| Orinthia | ![]() |
Meaning : Pine Tree, Fair, Pale Used in : Irish |
| Orla | ![]() |
Meaning : Golden, Princess Used in : French, German, Irish, Latin, Polish, Danish, Australian, Chinese, Hebrew |
| Orlagh | ![]() |
Meaning : Golden Queen Used in : Irish, Australian |
| Orlaith | ![]() |
Meaning : Golden, Princess Used in : Irish, Australian |
| Orlaithe | ![]() |
Meaning : Golden Used in : Irish |
| Orna | ![]() |
Meaning : Little Pale Green One, The Color Of Olive Used in : French, Irish, Australian, Hebrew |
| Ornait | ![]() |
Meaning : Lady, Fair, Locks Used in : Irish, Irish |
| Ornat | ![]() |
Meaning : Small Or Pale One Used in : Irish |
| Ornora | ![]() |
Meaning : Honor Used in : Irish, Latin |
| Osmanna | ![]() |
Meaning : Saint's Name Used in : Irish |
| Osnait | ![]() |
Meaning : Deer Used in : Irish |
| Osnit | ![]() |
Meaning : Deer Used in : Irish |
| Ownah | ![]() |
Meaning : Form Of Una, Unity Used in : Irish |