[view] • Name Tags are items that are used to name mobs by right clicking on the object or mob. Name tags are not craftable, and the only way to legitimately obtain them in survival is to find them in Dungeon chests or by Fishing. The new names will display over the head of the object or mob like a player's name would in multi-player.
Name Tags must first be renamed with the use of an Anvil before being applied to a mob (which, as of 1.8, costs 1 experience level). To use a name tag, simply hold the item in your hand and right click on the mob to name it. Once done the new name will display.
Naming mobs is usually the desire behind obtaining name tags. They are useful because name tags will prevent the named mob from de-spawning, such as when the player moves too far away, for example. This makes it a great tool for hostile mobs which disappear often, or for just naming neutral mobs and passive mobs such as horses to save them for the player to use, no matter how far away they are or how long ago they have been "rendered."
If a mob is renamed Dinnerbone or Grumm, the mob will be flipped upside down.
If a sheep is renamed "jeb_", the sheep being named will become rainbow. Its wool will transition between several different colours. However, when sheared, its wool will be the original color (for example: if you named a brown sheep "jeb_", its wool will still be brown).
To be able to see the name on the tagged mob or object, the Player must be 1-4 blocks away.
If a Rabbit is named "Toast", it will have a special (black and white spotted) texture.
Also, you can't get an upside down "Toast" rabbit or "jeb_" sheep, because, if name tagged Dinnerbone or Grumm, it will overwrite the original name.
"The Killer Rabbit of Caerbannog" (a rare type of Rabbit) spawns whit a name above him, saying "The Killer Bunny".