An Etymological Dictionary of the German Language/Annotated/Storren
Storren, masculine, ‘stump of a tree,’ from the equivalent Middle High German storre, Old High German storro, masculine, which is connected with Old High German storrên, Middle High German storren, ‘to stand out, project’ (Gothic andstaúrran, ‘to grumble, murmur’; root star, see starr. To this is allied störrig, adverb, ‘stubbornly, obstinately,’ Modern High German only; literally ‘clod-like, of the nature of a clod.’