An Etymological Dictionary of the German Language/Annotated/Esche
Esche, feminine, ‘ash, ash-tree,’ from the equivalent Middle High German asch, Old High German asc, masculine; corresponding to Dutch esch, Anglo-Saxon œsc, English ash, Old Icelandic askr, ‘ash.’ The remoter cognates, Slavonic jasika, Lithuanian ůsís, with the same meaning; Greek ὀξύη, ‘a kind of beech,’ and Latin aesculus, ‘winter oak,’ are not allied.