It is the hypothetical source of/evidence for its existence is provided by: Sanskrit svanati "it sounds," svanah "sound, tone;" Latin sonus "sound, a noise," sonare "to sound;" Old Irish senim "the playing of an instrument;" Old English geswin "music, song," swinsian "to sing;" Old Norse svanr, Old English swan "swan," properly "the sounding bird."
<a href="https://www.etymonline.com/word/sone">Etymology of sone by etymonline</a>
Harper, D. (n.d.). Etymology of sone. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/sone