Doc
from Fancyclopedia 2 ca. 1959
Most often the nickname standing alone refers to Robert W Lowndes, but it may mean C L Barrett or Paul Hammet Medicinae Doctores or R D Swisher, Wm H Evans, Andrew T Young, or E E Smith Philosophiae Doctores.

from Fancyclopedia 2 Supplement ca. 1960:
Omitted were Doc Weir, D SC, and Doc Keller, MD; added later was Burton Toskey, PhD (who didn't get his degree in time for the last issue of Fancyclopedia II; erroneously included was Andy Young, who won't make his PhD until spring.
from Fancyclopedia 1 ca. 1944
Most often the nickname means Robert W Lowndes, but frequently it designates R D Swisher Ph D, and sometimes refers to C L Barrett M D or E E Smith Ph D.