celebrated with dancing, came to be known as Walpurgisnacht ("Walpurga's night"). The name of the holiday is Walpurgisnacht in German and Dutch , Valborgsmässoafton in Swedish , Vappu in Finnish , Volbriöö , ( Walpurgi öö ) in Estonian , Valpurgijos naktis in Lithuanian , Valpurģu nakts or Valpurģi in Latvian