yon (adj., pron.)youdaoicibaDictYouDict[yon 词源字典]
Old English geon "that (over there)," from Proto-Germanic *jaino- (cognates: Old Frisian jen, Old Norse enn, Old High German ener, Middle Dutch ghens, German jener, Gothic jains "that, you"), from PIE pronominal stem *i- (cognates: Sanskrit ena-, third person pronoun, anena "that;" Latin idem "the same," id "it, that one;" Old Church Slavonic onu "he;" Lithuanian ans "he"). As an adverb from late 15c., a shortening of yonder.[yon etymology, yon origin, 英语词源]