Thank you Jap. I have researched the Fortable Campbell/Simers/McKenna family thoroughly so have all the information you found. ...
Hello again Callywoods/Mary,
It is always helpful, when posting a query, to tell RootsChatters what information you
already have so Chatters don't toddle off and busily duplicate searches which have already been done.

Incidentally, have you found any record of James SIMERS (however spelled) as a
butcher other than on Fortable's marriage certificate?
And have you found his death and/or do you have his death certificate?
Do you have Fortable (SIMERS) MCKENNA's death certificate - any clues?
Did Fortable have any siblings that you know of? Any clues there?
Any clues in the witnesses to the marriage of Fortable and David?
Incidentally, even if - for whatever reason - James and/or Fortable changed their names (given and/or surnames), that doesn't help to explain where the name Fortable originated ...
Hello Steve,
Presumably Catherine's mother was still given as (some variant of) Eliza MURPHY?
Fortable doesn't seem to have any provenance - at least nothing which any of us has yet been able to find.

Regards to you both,
JAP