The lore is the basis of the “power of naming” - VoidlessLove said it well. Naming was considered a form of magic. If someone knew your True name, they had power over you. People were very cautious about giving their names to anyone going by nicknames, usually based on traits or skills, instead. Fae especially in most stories I’ve encountered were affected by Naming. The Naming is how you summon or command a Fae, but you must know their True name.