Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 101 | Oreb | Biblical | A raven. | M | |
| 102 | Orell | English | Ore hill. Both a surname and a place name. | M | |
| 103 | Oren | Hebrew | Pine tree. | M | |
| 104 | Orion | Greek | Rising in the sky; dawning. Mythological Orion was a mighty hunter and son of Poseidon. The constellation Orion contains three conspicuous stars. | M | |
| 105 | OrIyg | Norse | Son of Valthjof. | M | |
| 106 | Orlan | German | Renowned in the land. Form of Roland. | M | |
| 107 | Orland | Teutonic | Fame of the land. | M | |
| 108 | Orlando | German | Variant of Roland: Famed land; renowned in the land. | M | |
| 109 | Orlando | Italian | Variant of Roland: Famous land;.heroic. | M | |
| 110 | Orleans | Shakespearean | 'King Henry V' Duke of Orleans. | M | |
| 111 | Orlege | Anglo-Saxon | Battle strife. | M | |
| 112 | Orran | English | The name of an English river. | M | |
| 113 | Orsino | Italian | Little bear. | M | |
| 114 | Orson | French | Bear cub. Famous Bearer: American actor/director Orson Welles. | M | |
| 115 | Orson | Latin | Little bear. Actor and director Orson Welles. | M | |
| 116 | Orthros | Greek | Guardian of Geryon. | M | |
| 117 | Orval | French | Variant of Orville: Gold town. Famous Bearer: aviator Orville Wright (1871-1948) who (along with his brother Wilbur) designed and built the first true airplane. | M | |
| 118 | Orvelle | French | Gold town. | M | |
| 119 | Orville | French | Gold town. Famous Bearer: aviator Orville Wright (1871-1948) who (along with his brother Wilbur) designed and built the first true airplane. | M | |
| 120 | Osahar | Egyptian | God hears me. | M | |