Vaast m
Flemish: borne by a 6th-century saint, bishop of Arras-Cambrai. His name appears in medieval sources in the Latinized form Vedastus, and is of uncertain origin. It is probably a contracted form of the name Widogast (or Widigast), which is also found in medieval documents; it is composed of the Germanic elements widu wood + gast guest.
First names dictionary. 2012.