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Dutch word koek comes from Proto-Indo-European *gōg-, Proto-Indo-European *gog, and later Proto-Germanic *kōkô (Cake.)
*gōg- (Proto-Indo-European)
round, ball-shaped object; lump; clump
*gog (Proto-Indo-European)
ball-shaped object
*kōkô (Proto-Germanic)
Cake.
*kōko (Old Dutch)
*kuoko (Old Dutch)
coeke (Middle Dutch)
Cake.
koek (Dutch)
(by extension) something doughy or sticky. (heraldiccharge) roundel. Cookie, cake, wafer.