Edna was your g-grandmother? If so..that would make her birth year somewhere in the late 1800s probably..and HER mother's birth year maybe mid 1800s..
Is it possible that the last name was actually "Wise", and a middle name was written on an old document and accidentally made to appear as part of the last name? Or do you know for a fact that the last name has two parts, whatever the proper spelling is?
B.E.