| Name | Gender | Meaning | Favorites |
| Onan | Boy | Properous | |
| Ondrea | Girl | Strong | |
| Onkar | Boy | Lord's Name | |
| Onkarjit | Boy | Triumph of the Inseparable Creator | |
| Onkarpreet | Boy | Love for god's name | |
| Onslow | Boy | Hill of the passionate one | |
| Onur | Boy | Honor | |
| Oojam | Boy | Enthusiasm | |
| Oopajai | Boy | Dwell, Reside | |
| Oorja | Girl | The energy | |
| Oorjit | Boy | Powerful | |
| Oorjitha | Girl | Powerful | |
| Oormila | Girl | The youger sister of Sita | |
| Oparna | Girl | Parvathi | |
| Ophelia | Girl | Serpent | |
| Ophira | Girl | Gold | |
| Ophra | Girl | Young Fawn, Young Mountain | |
| Ophrah | Girl | Light | |
| Opinder | Boy | Nearness to god | |
| Oppilan | Boy | Peerless gem | |
