| # | Moon | Year discovered | Origin of the name |
|---|---|---|---|
| 1 | Triton | 1846 | Greek god of the sea |
| 2 | Nereid | 1949 | Nereids are sea nymphs |
| 3 | Naiad | 1989 | Water or river nymphs |
| 4 | Thalassa | 1989 | A Greek sea goddess |
| 5 | Despina | 1989 | Daughter of Demeter and Poseidon |
| 6 | Galatea | 1989 | Wife of Pygmalion |
| 7 | Larissa | 1989 | One of Poseidon's lovers |
| 8 | Proteus | 1989 | A Greek sea god |