Etymology
From Dutch Low Saxon pesel or West Flemish pezel, diminutive of Middle Dutch pese (“a sinew, tendon, string, pizzle”), from Old Dutch *pisa (“sinew, string, fibre”), possibly ultimately related to vezel (“fiber”), from Proto-West Germanic *fas-il-, from Proto-Indo-European *pē̆s- (“to blow”) (see Old High German faso (“fiber”)); in which case this alternation *pes- / *fes- may indicate a repeated borrowing from a (non-Indo-European?) substrate language.
Cognate with Dutch pees, Middle Low German pese (“tendon, bowstring”), Dutch pees (“sinew, tendon”), German Low German Peserick, Pesel (“pizzle”), dialectal German Pisel (“penis”).