The external USB hard drive share name showing up multiple times is a well known issue discussed in several other previous threads. The solution is to remove the USB hard drive, then via the My Cloud Dashboard, delete all other instances of the USB hard drive name. Then reattach the USB hard drive and change the Share name back to its initial name via the My Cloud Dashboard.
Just a few of the past threads on this issue:
https://community.wd.com/t/new-release-firmware-release-04-04-02-105-1-27-2016/148441/69
https://community.wd.com/t/can-not-create-safepoint-for-backups/158687
https://community.wd.com/t/usb-drive-makes-new-name/152675
https://community.wd.com/t/dublicate-shares-after-reboot/153348
