Word Origin & History
1822, from Ger. Walpurgisnacht, witches' revel, especially on Brocken, on May-day eve, lit. "the night of (St.) Walpurgis," from Walburga, Eng. abbess who migrated to Heidenheim, Germany, and died there c.780; May 1 being the day of the removal of her bones from Heidenheim to Eichstädt.