Joe, here is the link to the record:
The same abbreviation is used to refer to two men ("... Andre de Miur.a filho de Manuel Miur.a...") on the record at the top of the page. I am wondering if the abbreviation means Moreira.
Moreover, if you keep flipping the pages of the late 17th wedding records of Santa Cruz, Lagoa, you will not find a single devotional name, and all women have surnames.
Then again, I am not an expert in 17th century Portuguese Palaeography, so my guess is as good as yours.
Thanks,
Carlos