Eponym

The mythological Greek hero Orion is the eponym of the constellation Orion, shown here, and thus indirectly of the Orion spacecraft.

An eponym is a noun after which or for which someone or something is named. Adjectives derived from the word eponym include eponymous and eponymic.

Eponyms are commonly used for time periods, places, innovations, biological nomenclature, astronomical objects, works of art and media, and tribal names. Various orthographic conventions are used for eponyms.