Which of these animals shares its name with a type waterproof boot?

The animal that shares its name with a type of waterproof boot is the Wellington boot.

Wellington boots, commonly known as wellies or gumboots, are named after Arthur Wellesley, 1st Duke of Wellington, who popularized their use during the Peninsular War in the early 19th century. Originally made of leather, modern Wellington boots are typically made from rubber, PVC or other synthetic materials, providing water-resistant or water-proof protection for the wearer's feet and legs.