Thread:Sinthorion/@comment-26453572-20150913225004/@comment-27723099-20150914174858

An NBT editor is an external program (for 1.6 there also was a mod with an ingame NBT editor) that lets you edit the NBT data structure, where all the data of Minecraft is stored. Google and install NBT Explorer (one of the best NBT editors) and open your Minecraft world in it.

I think the tavern names are located in the LOTR.dat file. Maybe use a search function to find the tag with the name of the tavern. Then you can simply edit it and save the data. Make sure that you don't have this world opened in Minecraft while editing the data.