harlequin
Pronunciation: /ˈhɑːlɪkwɪn/
noun

Origin:
late 16th century: from obsolete French, from earlier Herlequin (or Hellequin), the name of the leader of a legendary troop of demon horsemen; perhaps ultimately related to Old English Herla cyning 'King Herla', a mythical figure sometimes identified with Woden