You are inquiring about the origin of the name Delorme dit Dube. In in a branch coming from France as Dube (Dubes) dit Delorme. The first one coming in Canada, Jean Dubes, came in 1758 as a soldier and maried Marie-Anne Martin. He had 3 sons: Jean-Baptiste (1766), Joseph (1774) and Charles (1785). The descendant of Joseph kept the name Dubé and those of the other two kept the name Delorme.
I don't know if that seems to be in your family. If so I have other information on the origin of the family.