Etymon
gem-koko-old-dutch-kuoko-middle-dutch-coeke-dutch-koek-protogermanic-ukaz-protowest-germanic-uk-protogermanic-ina-protowest-germanic-in-protowest-germanic-ukin-old-dutch-kin-middle-dutch-kijn-dutch-tjen-dutch-je-dutch-koekiebor
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.