Minecraft wiki entry for Chest, associated text: By default, the GUI of a chest is labeled "Chest" and the GUI of a large chest is labeled "Large Chest". A chest's GUI label can be changed by naming the chest in an anvil before placing it, or by using the /data command‌[Java Edition only] (for example, to label a chest at (0,64,0) as "Bonus Chest!", use /data merge block 0 64 0 {CustomName:'"Bonus Chest!"'}). If half of a large chest is renamed, that name is used to label the GUI of the entire large chest, but if the named half is destroyed the other half reverts to the default label. If both halves of a large chest have different names, the GUI uses the name of the northernmost or westernmost half.