| Name | Meaning | Gender | Origin |
|---|
| Munchkin | A very small elflike person. | Unisex | |
| Nala | African for love, after the character in the Lion King movies | Female | African |
| Newt | a small salamander | Male | English |
| Nibbles | | Unisex | |
| Nietzsche | | Unisex | Hebrew |
| Niko | victory of the people | Male | Greek |
| Nugget | as in Chicken | Unisex | |
| Nutmeg | | Male | |
| Nyx | Greek goddess of night | Female | Greek |
| Obie | O.B. | Unisex | |
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| Olympia | of Mount Olympus, heavenly | Female | Greek |
| Onassis | | Male | Hebrew |
| Ophelia | Serpentine
| Female | Greek |
| 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 | |
| Oscar | God's spear.
| Male | English |
| Osiris | with strong eyesight | Male | Egyptian |
| Othello | he has the sound of God | Male | Hebrew |
| Ozone | | Male | Hebrew |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Paisley | church, cemetery | Female | Scottish |
| Pancho | Nickname for Francisco and Frank.
| Male | Spanish |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Patches | | Male | |