Misnomers

Recently, I wrote about how the turkey bird is mistakenly named for the country Turkey. It's an example of a misnomer. A misnomer is a name that is incorrect, unsuitable, or misleading for the thing it refers to.

Misnomers generally occur for one of three reasons:
Scientific Reclassification: We learned more about the item (e.g., biology) after it was already named.
Historical Changes: The object changed, but the name stayed the same (e.g., "tin" foil is now aluminum).
Foreign Origin Errors: The name was based on a misunderstanding of where the item came from. Such is the case for the turkey bird.

Other common examples

• Peanuts are not nuts; they are legumes (related to beans and peas).
• Lead pencils are a misnomer because pencils have never contained lead.  The core is a mixture of graphite and clay. But when graphite was discovered, it was mistaken for a form of lead.
• Koala bears are not bears; they are marsupials (pouched mammals).
• Neither jellyfish nor starfish is a fish. Biologists prefer "sea jellies" and "sea stars" because fish are vertebrates with gills, while these are invertebrates.
• Your "funny bone" isn't even a bone. It is the ulnar nerve running against the humerus bone. Humerus and humorous mix to describe that "funny" sensation when the nerve is being pinched.
• Fireflies are beetles, not flies.

A cute koala - but not a bear