Instructions
Press the "tilde" and "grave" key (~/`) on your keyboard while in "Oblivion." Click the container you want to rename.
Type "SetFullActorName X" without the quotes. Replace "X" with the name you want for the container. If you want the name to be two or more words, you must set those within quotes as follows: SetFullActorName "Multiple Words".
Press "Enter." Hover the cursor over the container. In the lower right-hand corner, you will see the new name displayed.