The middle name of Atwater goes all the way back to her Great Grandfather Dr. William Atwater Proctor b. 1826 to Thomas Proctor. But I don't know of any Atwaters in the line.

The Middle name follows all descendants to Peggy.

William
Samuel
Carter
Peggy

Maybe some Atwaters in Doniphan, MO or VA could be some help.

JoeP