Triton.

Internationalism, borrowed from Ancient Greek Τρίτων (Trítōn, “Triton, the Greek sea god”). The Ancient Greek name is of uncertain origin. It has been connected with the second element of Ἀμφιτρίτη (Amphitrítē, “Amphitrite”), the name of Triton's mother. Proposed connections with τρεῖς (treîs, “three”), sometimes interpreted in reference to the trident, and with Old Irish triath (“sea”) are uncertain. The Greek name was borrowed into Latin as Trītōn (“Triton”). The astronomical sense is named after the mythological Triton. The moon was discovered by William Lassell on 10 October 1846, shortly after the discovery of Neptune. For several decades it was generally referred to simply as the satellite of Neptune. The name Triton was proposed by Camille Flammarion in his 1880 work Astronomie populaire, after the sea god, son of Poseidon; Poseidon corresponds to the Roman god Neptune. Parallel international forms include Danish Triton, Swedish Triton, German Triton, Dutch Triton, Finnish Triton, French Triton and English Triton.