| Oriola | One who is like a golden bird. |
| Oriold | A name meaning golden ruler. |
| Oriolda | A golden or precious treasure. |
| Orithya | Mountain Goddess |
| Orlagh | A golden princess or ruler. |
| Orlain | Derived from golden land. |
| Orlanda | Famous throughout the land. |
| Orlande | A bright and famous land. |
| Orlinda | A beautiful golden shield. |
| Ormonda | Descendant of Ruadh |
| Ornagrine | A golden and green spirit. |
| Ornat | Littlesallowone |
| Ornette | Like an Ash Tree |
| Ornora | A golden light of the dawn. |
| Orofrigia | A golden land of the east. |
| Oroni | A golden and noble person. |
| Orosia | Derived from the Greek word for mountain. |
| Orpha | Back of the Neck, A Fawn |
| Orsa | A name meaning little female bear cub. |
| Orsaline | A name meaning golden or gilded one. |
| Orselina | A name meaning little bear of gold. |
| Orseline | A name meaning little golden bear. |
| Orsi | A Hungarian name meaning little bear. |
| Orsola | Strong as a Little Bear |
| Orsolla | A name meaning little female bear. |
| Orsolya | Strong as a Little Bear |
| Orszebet | A name meaning pledged to God alone. |
| Orugle | A name meaning one who is golden. |
| Orvale | A name meaning golden valley dweller. |
| Orvokki | The Finnish name for a pansy. |
| Orwina | A friend of the golden spear. |
| Oryna | One who brings peace and calm. |
| Osandi | A gift from the divine spirit. |
| Osanne | A prayer of praise to the Lord. |
| Osburh | A protected fortress of God. |
| Osgifu | A generous gift from the gods. |
| Osgyth | A battle maiden of the gods. |
| Osh | A name meaning light or fire. |
| Oshani | A name meaning a shining star. |
| Oshari | A name meaning a joyful soul. |