Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 81 | Orlantha | Teutonic | Renowned fame. | F | |
| 82 | Ornan | Biblical | That rejoices. | F | |
| 83 | Orpah | Biblical | The neck or skull. | F | |
| 84 | Orphe | Latin | Lover of Dionysus. | F | |
| 85 | Orquidea | Spanish | Orchid. | F | |
| 86 | Ortygia | Greek | Calypso's island. | F | |
| 87 | Orva | French | Worth gold. | F | |
| 88 | Orzora | Hebrew | God's strength. | F | |
| 89 | Orzsebet | Hungarian | Form of Elizabeth: consecrated to God. | F | |
| 90 | Osana | Spanish | Health. | F | |
| 91 | Osk | Norse | Mother of Hild. | F | |
| 92 | Otilie | German | Fortunate heroine. | F | |
| 93 | Otrera | Latin | Mother of the Amazons. | F | |
| 94 | Ottilia | German | Of the fatherland; fortunate heroine. | F | |
| 95 | Ottilie | Teutonic | Lucky battle maiden. | F | |
| 96 | Otylia | Polish | Lucky heroine. | F | |
| 97 | Oudsiyya | Muslim | Glorious. Holy.. | F | |
| 98 | Ourra-Tul-Ain | Muslim | Delight of eye. Darling.. | F | |
| 99 | Ove | Celtic | Mythical daughter of Dearg. | F | |
| 100 | Overdone | Shakespearean | 'Measure for Measure' Mistress Overdone, a bawd. | F | |