There are way too many pages in this thing.
I just read the original post and scanned the first
few comments... So if I am on the millionth page now,
sounding like an idiot, then so be it.
I don't know where the terms penny and nickel came from...
All I know is that my 80-something Grandparents call the
coins these names, and always have. So wherever the terms
came from, it was even before them.
That said, just like the term Indian was slang
(or misnomer at best) in the 17th century,
it is accepted and understood to mean something
today. That is good enough.
There comes a point where you just know what a word
means, accept it, and leave it at that. A penny is
what it is, where you are located. Where I am, it
always has, and always will, refer to a U.S. cent
coin.
It doesn't refer to the denomination, it refers to the
coin itself. You wouldn't call a nickel "a 5 penny coin".
Just the same, you wouldn't call a dime something like
a "double nickel" or "2 nickel piece".
Live with it...
Edit:I just thought of something that made me snicker...
What if the same people that dump on the term "penny" being
used in the U.S. were in the 18th-19th centuries?
Would someone shout out in alarm "Look out, Indians!",
in order to warn folks of hostile Native Americans
about to attack... Then that anal retentive person stop to
correct them, rather than ducking for cover...

Natural selection would have truncated this argument!