iCloud
Rename files and folders in iCloud Drive on iCloud.com
You can change the name of files and folders in iCloud Drive.
Note: You can’t change the names of app folders, such as Pages, Numbers, and Keynote.
In iCloud Drive on iCloud.com, tap Select, then select the file or folder you want to rename.
Tap the Info icon
in the iCloud Drive toolbar, then edit the name in the Info pane and tap Return on the keyboard.