More importantly (might as well start now!): what do we have twelve of that would be good names for a Sub?
Looking at history, the RCN has neglected its submarine force to the point where there is minimal established precedent to use for a naming scheme.
CC-1 & CC-2.
CH-14 & CH-15.
U-190 & U-889.
Grilse & Rainbow.
Ojibwa, Okanagan & Onondaga.
Victoria, Chicoutimi, Corner Brook & Windsor.
Considering the fact the RCN/Canadian govt did not use the 'Tribal' class names for the Canadian Surface Combatant, I do not think they would use them for the CPSP will use them as well. Obviously the alphabetical and numerical designations aren't going to fly and personally, I think naming everything after towns/cities is bland and uninspired. I would put forward two class name ideas, one named after fish found in/around Canada and one named after prominent Canadian submariners/figures.
"Fish" class - Rainbow, Grilse, Pickerel, Pike, Chinook, Steelhead, Wolffish, Redfish, Skate, Cod, Halibut & Sturgeon.
"Figures" class - William Maitland Dougall, Bernard Johnson, Adrian Keyes, Bertram Jones, etc to name a few.
I have some reservations about using the names of people, per the usual concerns alongside the fact that RCN submariners have never been a very diverse bunch, so that likely wouldn't hold up like you see with the choices for the AOPS. Realistically you could do whatever you like as there is no properly established naming conventions.
If it requires a redesign then we aren't buying a MOTS, we're buying something and changing it (again) and that adds time and cost.
I personally have a hard time believing that Canada will buy wholesale into another nations weaponry ecosystem when we have been established in the US ecosystem for so long, for both logistical reasons and interoperability with current/US systems. Obviously there needs to be a limit to what is allowed to be changed, otherwise we get into an Attack class scenario.