Neptune is the Roman name for the Greek god of the sea, the trident-wielding Poseidon. The first of the moons is named for his son, but most of the others are named for one or another of the 50 marine nymphs of the (Mediterranean) Sea — the Nereids. The Naiads are fresh-water nymphs.
1 . Triton
2 . Nereid
3 . Naiad
4 . Thalassa
5 . Despina
6 . Galatea
7 . Larissa
8 . Proteus
9 . Halimede
10 . Psamathe
11 . Sao
12 . Laomedeia
13 . Neso
The largest moon of Neptune is Triton, named for the son of Poseidon and his wife Amphitrite, who is described as both a Nereid (daughter of Nereus, the Old Man of the Sea, and his wife Doris, daughter of Ocean[us]) and an Oceanid (one of the three thousand nymph-daughters of Ocean and Tethys, fresh water titan).
is any one of the Nereids.
is any one of the Naiads.
is the elemental spirit of Sea.
(Despoene) is a fertility goddess whose real name is known only to initiates in her mystery cult. She is a daughter of the sea god Neptune/Poseidon and the agriculture goddess Demeter.
is a Nereid whom the Cyclops Polyphemus fell in unrequited love with.
A nymph. Mother of Achaios. Possibly a daughter of Poseidon or Pelasgius, eponymous ancestor of the Pelasgians.
Another old man of the sea, possibly a son of Poseidon. A shape-shifter.
Nereid goddess of the brine.
Nereid goddess of sand beaches.
Nereid goddess of safe passage.
Nereid “leader of the folk.”
A Nereid, and possibly the mother of the Cumaean sibyl.