The Collaborative International Dictionary of English v.0.48:

Cooky \Cook"y\, n.; pl. Cookies. [Cf. D. koek cake, dim.
   koekje; akin to G. kuchen, E. cake; or cf. OE. coket, prob.,
   a sort of cake, and prob. of French origin.]
   A small, flat, sweetened cake of various kinds.
   [1913 Webster]