Guy,
Then, what should we do with this name as it was obviously used before the fort, at least, by the church? (see birth record).
Wikipedia is a good source but does not necessarily reflect the complete and true context of the time.
This reminds me of another such historical name on the same Montreal island: Sainte-Anne-du-Bout-de-l'Ile = Sainte-Anne-de-Bellevue.
Personnally, one or the other does not turn me off as I know the difference. It may not be the same for everybody.