Board Thread:Support Requests - Community Management/@comment-33279756-20180120011936/@comment-5558012-20180120060601

The ability to rename categories would be chaotic, with the current structure of the system, as the result of the reason above. Renaming categories would just create additional wanted categories and categories with no pages listed in them, hence there's no "Rename/Move" option for categories. If pages were added to categories instead of categories added to pages then it would stand to reason that categories could be renamed without the need to update every page with the new category name.

A script fortunately exists that works great for the occasional renaming of large categories.