Variable: user-full-name
user-full-name is a customizable variable defined in editfns.c.
Value
"root"
Documentation
The full name of the user logged in.
Probably introduced at or before Emacs version 19.29.
Source Code
// Defined in /usr/src/emacs/src/editfns.c
DEFVAR_LISP ("user-full-name", Vuser_full_name,
doc: /* The full name of the user logged in. */);