MEANING: noun: A name used internally to refer to a place, people, language, etc.
For example, Germany’s endonym is Deutschland, because that’s what Germans call their country.

ETYMOLOGY: From Greek endo- (inside, within) + -onym (word, name). Some related words endogenous and endogamy

END ONLY, M? - Just play the final two bars of the music, James

END ON YMA - the list of sopranos with a 4-plus-octave range

ENDONAM - 30 April 1975, upon the capture of Saigon by the People's Army of Vietnam and the Viet Cong