late 13c., probably from O.N. hvirfla "to go round, spin," related to hvirfill "circle, ring, crown," and to O.E. hweorfan "to turn" (see
whir). Whirlpool is attested from 1520s, but O.E. had hwyrfepol and wirfelmere; whirlwind is mid-14c., probably on model of O.N. hvirfilvindr.