I am not related to the Primeau; just helping. Sorry Peterborough cousins.
Giard is another possibility although not a widespread surname.
I still have another Québec Province-wide marriage repertory to check.TheDB I have checked is still incomplete. I will check Drouin's (blue books)
With regard to the baptisms I have mentioned in my previous e-mail, Charles I has to be one of them if born prior to 1800.That was a complete and accurate DB: PRDH (Programme de recherche en démographie historique.