originates from

PNWGmc *hʷarbijaną 'to turn, to change' (hʷarbijaną > hʷarβijan > hwarβijan > hwærβijan > hwærβjan > hwearβjan > hwierβjan > hwierβan > hwierfan) through pnwgmc-to-oe

PGmc *hʷarbjan- 'make turn' (hʷarbjan- > hwarβjan > hwærβjan > hwearβjan > hwierβjan > hwierβan > hwierfan) through pgmc-to-oe