Samwise Gamgee
In J. R. R. Tolkien's work "The Lord of the Rings", wills o' the wisp are present in the Dead Marshes outside of Mordor. When Frodo Baggins and Samwise Gamgee make their way through the bogs the spindly creature Gollum tells them "not to follow the lights", meaning the wills o' the wisp. He tells them that if they do, they will "keep the dead company" and "have little candles of their own".