Exactly what it says on the tin. I've been making a map to this affect and I have a few ideas, namely Columbia, New Hibernia/Caledonia, Cascadia but by gum they're very overused. Anyone have any ideas? And maybe for Canada in general if it hits you.
I should also note that on this map Canada is a Kingdom due to London being less shy about their imperialism after intervening in the US civil war, if that influences your naming choices at all.