If this thread is still alive, my tree includes some of the people mentioned in the first post:
Walter Blackball or Blackbell or Blackbull (depends how you read the handwriting) married Christian Kerr, who was baptised 23 March 1785 at Cockburnspath, daughter of David Kerr and Ann Grieve.
Walter Blackb?ll and Christian Kerr had a daughter, Agnes Blackb?ll, baptised 30 June 1805 at Longformacus, and she married James Laurie, 31 December 1857 at Whitsome. They had a daughter, Christian or Christina Laurie, born 9 July 1827 at Chirnside.
It would be nice to finally give these people a surname instead of a ? mark. How is the surname usually written today: Blackball, Blackbell, Blackbull, Blackhall?