This is supposed to be a trivia trope. Feel Free to edit it.
Sometimes, in literature or any other written piece of work, there may be a name of a character, item or location that doesn't have an intuitive pronunciation or a pronunciation guide.
This is where this trope comes into play. It can be during interviews about the works, a fan meet and greet, or a Celebrity Blog video.
Many times this is helpful to prevent Viewer Pronunciation Confusion from occurring as sometimes this happens.
Subtrope to Word of God.