This is what babel-french urges, and canadien currently is broken.
acadien seems to be there for at least 15 years.
# Unless polyglossia supports variant=canadian,
# we can use french, as canadien \eq. french also in babel
-# TODO: 'canadien' has been declared obsolete in babel
-# in favor of 'acadien'. Change the babel name once
-# this has settled
Language canadien
GuiName "French (Canada)"
- BabelName canadien
+ BabelName acadian
PolyglossiaName french
# PolyglossiaOpts "variant=canadian"
QuoteStyle french