Quote Originally Posted by MacWage View Post
Off the TOP of my head (ie-> NOT LOOKED UP)

IF the family IS Scottish, you might want to look into the Hardin family. The name has enough grammatical similarity to be possible.
NOT saying it IS, but that it COULD BE.
According to Surname Profiler

http://www.spatial-literacy.org/UCLnames/default.aspx

both Hardin and Harden are English names, not at all Scots.