Renaming Folders

I'm sure there's some way to do this but I just cant figure it out.

I'm trying to organise my ebook collection and currently have them sorted in Directories by Author Name

Eg

J.K. Rowling
Daniel Schinhofen
J. R. R. Tolkien

I'd like to rename them

Rowling, J.K.
Schinhofen, Daniel
Tolkien, J. R. R.

Any help would be really appreciated

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