Transferred use of the surname, in origin a local name from places in Shropshire and West Yorkshire, so called from Old English hær ‘rock, heap of stones’ or hara ‘hare’ + lēah ‘wood, clearing’. Among bikers it has been used with the Harley Davidson motorcycle in mind.
English (Lancashire and Yorkshire): habitational name from Windhill in West Yorkshire or Windle in Lancashire, both named from Old English wind ‘wind’ + hyll ‘hill’, i.e. a mound exposed to fierce gusts. There is a Windhill in Kent (with the same etymology), but this does not appear to have contributed significantly to the modern surname.