| Name | Meaning | Gender | Origin |
|---|
| Nala | African for love, after the character in the Lion King movies | Female | African |
| Nana | A grandmother. | Female | English |
| Neeko | | Unisex | Hebrew |
| Neko | Japanese for 'cat' | Unisex | |
| Nermal | | Unisex | |
| New Moon | | Unisex | |
| Nightflight | | Unisex | |
| Nightmare | A dream of intense fear or horror. | Unisex | |
| Nika | born on Sunday | Female | Russian |
| Nipper | A small boy | Unisex | |
| Nola | Noble or Famous | Female | Gaelic |
| Nova | A star that suddenly becomes much brighter. | Female | Latin |
| Nugget | as in Chicken | Unisex | |
| Nutsy | | Unisex | Hebrew |
| Obi Wan Kenobi | | Unisex | Hebrew |
| Oboe | | Unisex | |
| Odie | Melody | Unisex | French |
| Olga | holy | Female | Russian |
| Olive | kind one; olive tree, peace. Symbol of peace. A small oval fruit. | Female | English |
| Ondine | little wave | Female | Latin |
| 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 |
| Ophelia | Serpentine
| Female | Greek |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |