Most disorders/diseases are too complex to have a short name that accuratley describes what they are so I don't think a disorder being 'poorly' named is that big of a deal.
The WHO discourages this because people will start associating the name with the disease. Which sucks if you happen to have this name. See Tourette's, or Chagas disease.
Most of my mates are some flavour, colour and level of Wombleypoo, but tbqh I've never considered whether - like star signs - there may be incompatibilities there