In Greek Mythology, Hades and Persephone will often get named by epithets (The One Who Receives Many Guests or Infernal Zeus, or Nestis the Fasting One or Kore the Maiden for example) instead of their names because people were afraid that calling them by their name would get their attention and, as they were deities associated with death, you wouldn't want that.

Since the whole point is that Persephone needs to be called in story, it couldn't be her that shows up if Edmund calls her name, but I think it'd make sense that saying her name invokes enough of her power that it drives the spirits near him crazy.