| Othieno | - | African Name | Obalesh | - | Hindu Name |
| Ohel | - | Biblical Name | Orly | - | Hebrew Name |
| Oha | - | Hindu Name | Olympas | - | Biblical Name |
| Ohas | - | Hindu Name | Omar | - | Biblical Name |
| Orianna | - | Latin Name | Ojal | - | Hindu Name |
| Omega | - | Biblical Name | Ojas | - | Hindu Name |
| Omri | - | Biblical Name | Ojayit | - | Hindu Name |
| On | - | Biblical Name | Om | - | Hindu Name |
| Onam, Onan | - | Biblical Name | Odysseus | - | Greek Name |
| Ola | - | Muslim Name | Omanand | - | Hindu Name |
| Onesimus | - | Biblical Name | Oleander | - | Muslim Name |
| Oma | - | Hindu Name | Onesiphorus | - | Biblical Name |
| Olian | - | Muslim Name | Omar | - | Hindu Name |
| Ono | - | Biblical Name | Oma | - | Muslim Name |
| Odern | - | Aborigin Name | Omarjeet | - | Hindu Name |
| Ophel | - | Biblical Name | Omega | - | Muslim Name |
| Olba | - | Aborigin Name | On | - | Chinese Name |
| Omesa | - | Hindu Name | Ophir | - | Biblical Name |
| Onida | - | Muslim Name | Olono | - | Aborigin Name |
| Omeshwar | - | Hindu Name | Ophni | - | Biblical Name |
| Oriane | - | Muslim Name | Oola | - | Aborigin Name |
| Omja | - | Hindu Name | Ophrah | - | Biblical Name |
| Orad | - | Aborigin Name | Omkar | - | Hindu Name |
| Oreb | - | Biblical Name | Oceanna | - | Greek Name |
| Ogilhinn | - | Scottish Name | Orana | - | Aborigin Name |
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