Here's the breakdown:
* Quiz was first used in the 18th century, possibly as a slang term for a strange or eccentric person.
* Quizzical appeared shortly after, meaning "pertaining to a quiz" or "characterized by questioning or a curious look."
* Quiz has been used as a word for a short test or a game of questions and answers since the 19th century.
While the origin of "quiz" itself is uncertain, it is likely related to the idea of "questioning" or "being puzzled."
So, even though we don't know the exact etymology of "quiz," we can understand how "quizzical" evolved to mean "puzzled," "questioning," or "curious."