Hello Richard,
The comment that Andrew made about everything needs checking and much of it needs chucking (LoL) is accurate.
I didn't find anything in Ireland. Roots Ireland has little information on anything that is in the 1600's and MyHeritage is a Nightmare.
On the ScotlandsPeople Site I did find a Jeane Stewart Born or Baptism 12th June 1670. Musselburgh, Scotland
George Brownfield married to Mary Bruntone 23rd August 1753 Smailholm, Scotland.
George Brownfield married to Janet Waugh 29th July 1775 Melrose, Scotland
Alexander Brownfield and Isabel Beanston Parents of George Brownfield 1786 and John Brownfield 1782 Melrose, Scotland.
I hope this info. can be of Help
All the Best
Peter C.