Duppy originated in Jamaican lore. A vampiric spirit or benevolent spirit created by the shadow of the dead person. They’re feared because their breath can cause illness and if you’re touched, “Duppy boxing” can cause seizures.
In Caribbean lore, Duppies are called Jumbies.
You can conjure a Duppy by throwing Rum coins into a grave. They attack the living and cause poltergeist activities once raised.