RootsChat.Com

I am not au fait with more than the names of your family although I have heard them mentioned.  The name was originally Johnston, with members of the family having an S as a middle name standing for the "Saint".  My great x 3 grandmother was an Eliza S Johnston bapt in Manchester.  It was her father Thomas who was born near to Gretna Green in 1785.  A Reginald St Johnston wrote and published a book about Eliza's generation of Johnstons and he would have come from your line too I think as he refers to Thomas born circa 1851 as his grandfather.  You can google him - he was quite well known in his time with a lengthy public career.