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Puck is a mythological fairy or mischievous nature sprite. Puck is also a generalised personification of land spirits. Whilst being an aspect of Robin Goodfellow, he is also hob and Will-o’-the-wisp.

Etymology
The Old English puca is a kind of half-tamed woodland sprite, leading folk astray with echoes and lights in nighttime woodlands (like the German and Dutch Weisse Frauen and Witte Wieven and the French Dames Blanches, all “White Ladies”), or coming into the farmstead and souring milk in the churn.