| Name | Meaning | Gender | Origin |
|---|
| Nougat | | Unisex | |
| Nova | A star that suddenly becomes much brighter. | Female | Latin |
| Nuffe | | Unisex | |
| Nugget Meow | | Unisex | |
| Nun | | Unisex | |
| Odette | happy home | Female | |
| Ody | | Unisex | |
| Oldman Sea Seashell | | Unisex | |
| Oleander | | Unisex | |
| Olivarez | | Unisex | |
| One Direction | | Unisex | |
| Ontiveros | | Unisex | |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opaline | Precious Jewel | Unisex | English |
| Orca | | Unisex | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Osborne | soldier of God | Unisex | |
| Oxford | From the ox ford
| Male | English |
| Oz | strength | Male | Hebrew |
| Pacho | Free
| Male | |
| Page | young attendant | Male | |
| Paint | | Unisex | |
| Paloma | Dove
| Female | Spanish |