Is lupus an abbreviation, or is it named for a famous doctor or scientist?

Latin for wolf. Lupus is latin for "wolf" because wolves have marks on their faces that resemble the facial rash seen in lupus.
The wolf. Since people with lupus can have a red face, similar to which a wolf has. Thus the term "lupus erythematosus" - [red wolf] was developed to identify these patients with a red face, but also a variety of other signs and symtoms.