Lyssavirus

Etymology
Lyssavirus

lyssa: "Lyssa" (the greek spirit responsible for rage, madness, frenzy, and therefore in animals, rabies)

virus: "poisonous secretion" (from latin vīrus, meaning "venom" or "poisonous secretion")

Explanation
Lyssa was the greek goddess/spirit that was said to be responsible for the spirit of madness which possesses animals that have been infected by rabies, hence why rabies is a lyssavirus. Viruses, being so small, might have been thought of before they were discovered, to be poisonous secretions (virus) of unknown origin, hence their name.

Synonyms
Rabies virus