Unable to change name of Minecraft world

When I went to change the name of my world after I created several copies of it I was unable too. Now its stuck as "Copy of a Copy of Minenite (8)". I would like to change the name as its the most recent version of my world but when I go to change it it doesn't allow me too. I can change other worlds names but I believe this one may have to many characters and that makes the name unable to be changes.  Thanks in advance!