eponym

Definition of Eponym in English :

1. eponym

the person for whom something is named

Example Sentences:
'Constantine I is the eponym for Constantinople'

2. eponym

the name derived from a person (real or imaginary)

Example Sentences:
'Down's syndrome is an eponym for the English physician John Down'

WordNet Lexical Database for English. Princeton University. 2010.

Eponym

noun

1.

a name, esp a place name, derived from the name of a real or mythical person, as for example Constantinople from Constantine I

2.

the name of the person from which such a name is derived

in the Middle Ages, "Brutus" was thought to be the eponym of "Britain"

noun

1.

a real or mythical person from whose name the name of a nation, institution, etc. is derived

William Penn is the eponym of Pennsylvania

2.

a person whose name has become identified with some period, movement, theory, etc.

n.

1. A word or name derived from a proper noun. The words atlas, bowdlerize, denim, and Turing machine are eponyms.

2. One whose name is or is thought to be the source of the name of something: Alexander Garden is the eponym of the gardenia.