Using Terminal, you can quickly and easily rename a Volume on your Mac. To do so, type the following command in a Terminal window:
/usr/sbin/diskutil rename oldname newname
For example, my USB Volume mounted as /Volumes/NO NAME, so I wanted to change it to /Volumes/USBDRIVE. To do so, I ran the following command:
/usr/sbin/diskutil rename “NO NAME” “USBDRIVE”