Yan-gant-y-tan
Yan-gant-y-tan is the name of a demon from Brittany, France. == Etymology == Collin de Plancy, in the Dictionnaire Infernal, gives the meaning of his name as 'Wanderer in the Night', but the translation of his name from Breton seems to be cognate to 'John with the Fire' (compare Will o' the Wisp).