Let me add James Keelaghan, and Stan Roger's brother, Garnet. Both have fine voices and are excellent instrumentalists and songwriters.
Can we claim Enoch Kent and Archie Fisher as they both live in Canada now?
Also, have a look at "Penguin Eggs" magazine (yes, named after the Nic Jones album.) which features loads of well-established and new faces on the Canadian folk scene.

http://penguineggs.ab.ca/index.php