Well, Whadya Know

Why do we call uproar "pandemonium?"

Some years ago, when China made a gift to the Washington D.C.
zoo of a pair of pandas, newspaper headline writers had a
field day playing off this word to describe the hullabaloo
caused by the creatures. The sound of the word, for me,
conjures up an image of people banging on pots and other hard
surfaces to make a racket. Maybe that occurred as well to the
17th century poet John Milton when he invented the word.

Speaking of Washington, Milton needed a name for the devil's
capitol city in his epic poem, Paradise Lost. So he played
around with Latin and Greek and came up with "pandemonium."
If you look at the middle of the word, beginning with the 4th
letter, you'll see an appropriate word within the word.

[source: The Oxford Dictionary of English Etymology]