Minecraft wiki entry for Dropper, associated text: By default, the GUI of a dropper is labeled "Dropper". A dropper's GUI label can be changed by naming the dropper in an anvil before placing it, or by using the /data command‌[Java Edition only] (for example, to label a dropper at (0,64,0) "Alice's Dropper", use /data merge block 0 64 0 {CustomName:'"Alice's Dropper"'}).