The mysticism of many cultures throughout history has assigned a power to knowing, saying and writing a demon’s true name. The earliest example of this I can think of is from the Ancient Egyptian Book of the Dead, the obscure god Medjed, “The Smiter” whose physical appearance can’t be known so when he’s depicted in heiroglyphs, he’s drawn as a bedsheet ghost with eyes and feet.. So to safely traverse the land of the dead you have to know him by his true name.

Call evil by its true name.