The letter to Bill Schelter from the US Dept of Energy says..
Dear Dr. Schelter:
RE: DOE-MACSYMA
This is in reply to your request of September 17, 1998, requesting a
license to prepare and distribute derivative works from the copy of
DOE-MACSYMA software obtained from the NESC. ...
etc...
So the name of the program is DOE-Macsyma.
We are free to invent another name, like SymaCas, but that does not help
the people who want to find
references to Macsyma or DOE-Macsyma or the computer algebra system
Maxima derived from
DOE-Macsyma.
In tribute to the late Leslie Neilsen, we could call it Shirley..
http://www.youtube.com/watch?v=0A5t5_O8hdA
except that is apparently also the name of a band..
RJF