http://en.wikipedia.org/wiki/Addison%27s_disease
If you like this vein of naming, I also heartily recommend Hodgkin
http://en.wikipedia.org/wiki/Hodgkin%27s_lymphoma
or perhaps Harlequin
http://en.wikipedia.org/wiki/Harlequin_type_ichthyosis
or Rubella
http://en.wikipedia.org/wiki/Rubella
Yes yes,
Addison was a surname first. And by all means, use it if you have an
Addison in the family tree to honour. But be forewarned about the disease connection. I would have been mortified to learn there was an illness with my name as a child.