The Century Dictionary suggests it was originally applied to a popular toy, from a dialectal variant of whiz.
The Random House Dictionary suggests the original sense was "odd person" (circa 1780).
Others suggest the meaning "hoax" was original (1796), shifting to the meaning "interrogate" (1847) under the influence of question and inquisitive.
Some say without evidence it was invented by a late-18th-century Dublin theatre proprietor who bet he could add a new nonsense word to the English language; he had the word painted on walls all over the city, and the morning after, everyone was talking about it ().
Others suggest it was originally quies (1847), Latin qui es? (who are you?), traditionally the first question in oral Latin exams. They suggest that it was first used as a noun from 1867, and the spelling quiz first recorded in 1886, but this is demonstrably incorrect.
A further derivation, assuming that the original sense is "good, ingenuous, harmless man, overly conventional, pedantic, rule-bound man, square; nerd; oddball, eccentric", is based on a column from 1785 which claims that the origin is a jocular translation of the Horace quotation vir bonus est quis as "the good man is a quiz" at Cambridge.
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