eponym

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

被命为某物的；君士坦丁堡与君士坦丁一世齐。

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

前言主要是词的定义，阐词的发展和存在现状，并强调了词始终与语言的发展共时。