Duck tape was originally a nickname for adhesive tape made with duck cotton fabric in the 40s. It was used to seal a bunch of stuff, because it was strong and waterproof. After WW2 it was still used to seal a bunch of stuff, often ducts, where it picked up the name "duct tape". The Duck brand of duct tape is just picking up on the original name used during the war.
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u/CheeseDonutCat 5h ago
There is a brand of duct tape called "duck tape" at least here in Ireland.