Generally, you would reupload it again, but if you are just changing names, you might be able to do some scripting to get it done.
You could in theory do a show crypt name mapping and use the move the file to a new crypt area without the names encrypted using the same passwords/salts.
Check out rclone lsf crypt:somefile --crypt-show-mapping and you could move that to a newly named remote without filename obfuscation.