The word cookie dates from at least 1701 in Scottish usage where the word meant "plain bun", rather than thin baked good, and so it is not certain whether it is the same word. From 1808, the word "cookie" is attested "...in the sense of "small, flat, sweet cake" in American English. The American use is derived from Dutch koekje "little cake," which is a diminutive of "koek" ("cake"), which came from the Middle Dutch word "koke". Another claim is that the American name derives from the Dutch word koekje or more precisely its informal, dialect variant koekie which means little cake, and arrived in American English with the Dutch settlement of New Netherland, in the early 1600s.
What is the etymology of the word cookie?
The earliest known usage of the work cookie comes from 1701 in Scotland, where it meant "plain bun".  Starting in 1808 the term was associated with small, flat, sweet cakes as part of American English, which is believed to be derived from the Dutch word keokie.