| Name | Meaning | Gender | Origin |
|---|
| Nigel | Black haired one. | Male | Irish |
| Nova | A star that suddenly becomes much brighter. | Female | Latin |
| Nugget | as in Chicken | Unisex | |
| Nyx | Greek goddess of night | Female | Greek |
| Octavia | eighth | Female | Latin |
| Octavius | eighth | Male | Latin |
| Olaf | ancestor's relic | Male | Norse |
| Olga | holy | Female | Russian |
| Olympia | of Mount Olympus, heavenly | Female | Greek |
| Omar | first son, disciple; gifted speaker; famous | Male | Arabic |
| Ophelia | Serpentine
| Female | Greek |
| Oprah | Fawn | Female | Hebrew |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| 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 | |
| Orion | Son of Fire
| Male | Greek |
| Orlando | Famous land
| Male | Italian |
| Orson | Little bear
| Male | Latin |
| Orville | Gold town.
| Male | |
| Otis | Wealthy.
| Male | |
| Otto | Born eighth or wealthy
| Male | |
| Pabst | | Unisex | Hebrew |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Pandora | talented one | Female | Greek |