eponym

1.the name of a person for whom something is supposedly named; Constantine I is the eponym for Constantinople.

被命为某物的人；君士坦丁堡与君士坦丁一世齐。

2.The introduction is mainly about the definition of eponym, and emphasizing its development and synchrony with language.

前言主要是祖词的定义，祖词的发展和存在现状，并强调了祖词始终与语言的发展共时。