Coronavirus

Etymology
Coronavirus

corona: "crown" (from latin corōna, meaning "crown")

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

Explanation
Coronavirus, the virus responsible for 30% of common colds, as well as SARS, has the appearance of a crown (corona) under electron microscopy, due to the spike proteins that coat the viral surface. Viruses, being so small, might have been thought of before they were discovered, to be poisonous secretions (virus) of unknown origin, hence their name.

The most recent coronavirus pandemic, COVID-19, was so named because it is a Coronavirus Disease, which emerged in 2019.