Definition from Wiktionary, the free dictionary
eponym (plural eponyms)
- The name of a real or fictitious person whose name has, or is thought to have, given rise to the name of a particular item.
- Romulus is the eponym of Rome.
- A word formed from a real or fictive person’s name.
Derived terms 
name of a person that has given rise to the name of something
word formed from a person’s name