An Etymological Dictionary of the German Language/Annotated/Schwarm

Schwarm, masculine, ‘swarm, cluster, throng,’ from Middle High German swarm, Old High German swaram, masculine, ‘swarm (of bees)’; allied to the Sanscrit root svar, ‘to rustle, resound.’ Compare Anglo-Saxon swearm, ‘swarm (of bees),’ English swarm, Old Icelandic svarmr. See schwirren.