why is the film called Pan's Labyrinth?

According to the director Guillermo del Toro, the use of the word Pan in the non-Spanish versions was just a translation issue. The faun-like creature, meant to be Pan, puts Ophelia through morality tests: a kind of labyrinth that is both literal and metaphorical.

Pan is just the translation, which is not accurate. It's a faun, because the faun in classical mythology was at the same time a creature of destruction, and a creature of nurturing and life....