Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 121 | Olwen | Welsh | White footprint. In 'Culhwch and Olwen', one of the Welsh stories from the 'Maginogion', the Olwen were white flowers growing in the heroine's footprints. | F | |
| 122 | Olwina | Welsh | White foot print. | F | |
| 123 | Olwyn | ArthurianLegend | Daughter of a giant. | F | |
| 124 | Olwyn | Celtic | Mythical daughter of Yspaddaden. | F | |
| 125 | Olwyn | Welsh | Variant of Olwen: White footprint. In 'Culhwch and Olwen', one of the Welsh stories from the 'Maginogion', the Olwen were white flowers growing in the heroine's footprints. | F | |
| 126 | Olya | Russian | Holy. | F | |
| 127 | Olympas | Biblical | Heavenly. | F | |
| 128 | Olympe | French | From Olympus. | F | |
| 129 | Olympe | Greek | From Olympus. | F | |
| 130 | Olympia | French | From Olympus. | F | |
| 131 | Olympia | Greek | From the home of the gods (Olympus). | F | |
| 132 | Olympia | Italian | From Olympus. | F | |
| 133 | Oma | Arabic | Commanding. | F | |
| 134 | Oma | Hebrew | Cedar tree. | F | |
| 135 | Oma | Irish | The color of olive. | F | |
| 136 | Oma | Latin | Named for Bona Dea. | F | |
| 137 | Omah | Hebrew | Cedar tree. | F | |
| 138 | Omat | Irish | The color of olive. | F | |
| 139 | Omega | Biblical | The last letter of the Greek alphabet, long O. | F | |
| 140 | Omette | Hebrew | Cedar tree. | F | |