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German word Keks comes from Proto-Indo-European *gog, Proto-Indo-European *gag-, and later Proto-Germanic *kakǭ (Cake.)
*gog (Proto-Indo-European)
*gag- (Proto-Indo-European)
*kakǭ (Proto-Germanic)
Cake.
kaka (Old Norse)
Cake.
cake (Middle English)
cakes (English)
Keks (German)
Cookie (US), biscuit (UK).