the.com/misnomer

A name that lied to you and nobody bothered to fix it.

means A name or label that is factually wrong or misleading, even though everyone keeps using it out of habit.

from From Anglo-French 'mesnomer,' built from 'mes-' (wrongly, badly — the same prefix lurking in 'mistake' and 'mischief') plus 'nomer,' from Latin 'nominare,' to name. So it's quite literally a 'wrong-naming,' first used in English legal contexts for paperwork that named the wrong person or thing — a lawyer's word for a clerical oops that has since wandered into everyday use for any label that just doesn't fit.

peanut
a legume, not a nut
koala bear
not a bear, a marsupial
root word
from latin for wrongly named
funny bone
it is a nerve, not a bone
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