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Dee, John - Elizibethan era English magician, occultist, and the inventer (along with some other guy) of the Enochian language.
Deja Vu - The feeling that you've been in a place before, or have the same thing happen to you.
Devil's Sea - Purportedly the Japanese version of the Bermuda triangle, it seems to exist only in fiction
Devil's Triangle - Sometimes used to describe the Bermuda triangle, at least in the movie of the same name.
Dolmen -
Dowsing -
Dracula - Perhaps the most famous vampire in the world, Dracula was also a real historical figure.