[788] Neptun, so v.w. Neptunus.
Brockhaus-1837: Neptun
Brockhaus-1911: Neptun [2] · Neptun
DamenConvLex-1834: Neptun (Mythologie)
Herder-1854: Neptun
Meyers-1905: Neptūn [2] · Neptūn [1]
Vollmer-1874: Neptun