1: a tree that bloom in may ( arbre De Mai ) 2; A tree that was custom to plant in may in front of the house. The first one to use that name according the old archives, Pierre Dumay alias Dumas & Dumetx ditRossignol, son of Jean & de Marguerite Richard, d'Omble, diocèse de Clermont-Ferrand, département du Puy-de-Dôme, province de l'Auvergne(Jocelyn Dumais BTW click on the crest to visit his Dumais Genealogy Website) - First found in Languedoc, France