An Etymological Dictionary of the German Language/Annotated/gellen
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gellen, verb, ‘to yell,’ from Middle High German gëllen, Old High German gëllan, strong verb, ‘to sound loud, cry’; corresponding to Dutch gillen, Anglo-Saxon gillan, Old Icelandic gjalla, ‘to resound’; allied to the Teutonic root gel, gal, ‘to resound.’ Compare Nachtigall.