56540b4c_Crafting_Guide___Raw_Materials__Description
[Name] Name Tag [Uses] Naming mobs [Description] 
Name tags are found in dungeon chests and can rename any mob except for the Enderdragon and adult Villagers. The name tag can be used in an anvil to set the name, and then right clicked on a mob to apply the name to the mob.
Minecraft Crafting Guide - Raw Materials
Description