Naming diseases

Is it more helpful to name diseases after their symptoms (eg whooping cough), the organs they affect (eg appendicitis), their discoverers (eg Wilson's disease) or something else entirely? Perhaps their cause? They'd each have their slight advantages, whether quicker diagnosis or teaching medical history. Sometimes I get the impression that some diseases could use better naming schemes, and they're usually the ones named after their discoverers.

Mokalus of Borg

PS - Also, since my medical opinion is based entirely on House, add a grain of salt.
PPS - It's never lupus.