| Orenthal | Man | American Names |
| Orestes | Man | Greek Names |
| Organza | Woman | Italian Names |
| Orhan | Man | Turkish Names |
| Ori | Unisex | Hebrew Names |
| Oria | Woman | Latin Names |
| Oriana | Woman | Latin Names |
| Orianthe | Woman | Greek Names |
| Oriel | Unisex | French Names |
| Orien | Unisex | Latin Names |
| Orinda | Woman | Hebrew Names |
| Oringo | Man | African - Luo of Kenya Names |
| Oriole | Unisex | Latin Names |
| Orion | Unisex | Greek Names |
| Orit | Woman | Hebrew Names |
| Orla | Woman | Irish Names |
| Orlaith | Woman | Irish Names |
| Orlando | Man | Italian Names |
| Orleans | Unisex | French Names |
| Orlena | Woman | American Names |