One of Murphy's Law of Genealogy...
Your grandmother's maiden name for which you've searched for years was on an old letter in a box in the attic all the time.
[S794] E-mail from Carolyn Bry to Wendel Voigt, Bry, Carolyn, (E-mail: ), [Schaefer p. 500], 26 Aug 2004.
Carolyn added a Worldconnect post with the information.