An Etymological Dictionary of the German Language/Annotated/jener
jener, pronoun, ‘you, yonder, that, the former,’ from the equivalent Middle High German jęner, Old High German jęnêr, allied to the differently vocalised Gothic jains, Old Icelandic enn, inn, Anglo-Saxon geon, English you (with which yonder is connected). In late Middle High German dër jęner, ‘that,’ is also used, whence Modern High German derjenige. —