| Name | Meaning | Gender | Origin |
|---|
| Myrtle | a flower, symbol of victory | Female | Greek |
| Nairobi | | Male | |
| Nesbit | land or river bend shaped like a nose | Male | English |
| Nevada | Snow-clad. A western USA state.
| Male | Spanish |
| Neville | from the new farmland | Male | |
| Newport | new port | Male | English |
| Newton | new town | Male | English |
| Nickleby | Nicholas's village | Male | English |
| Nikita | unconquered | Male | Russian |
| Norman | man from the north | Male | English |
| Norton | From the north farm
| Male | English |
| Nubia | From Nubia Africa, Gold | Unisex | Egyptian |
| Oakes | from the oak-tree grove | Male | English |
| Oakley | from the oak meadow | Male | English |
| Ocean | | Male | |
| Ogden | from the oak valley | Male | English |
| Olive | kind one; olive tree, peace. Symbol of peace. A small oval fruit. | Female | English |
| Ondine | little wave | Female | Latin |
| Onslow | from the zealous one's hill | Male | English |
| 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 |
| Orlando | Famous land
| Male | Italian |