A few years ago I discovered how to do this in Linux Mint...which comes in very handy especially if you have two Flash Drives plugged in at once or if you have Booted to your Mint ISO...mounted the main Drive and want to transfer files to another Flash Drive.
Plug in Flash Drive or External HDD...then type...Disks in Search Box and hit Enter.
Then Select...Flash Drive or External HDD...which will be at the bottom of list...click black square to Unmount...then click Cog Wheels...Select...Edit File System.
Then type new Name ie Bob...click ...Change...click Black triangle to Mount...done.
Go to Computer and Double click...Flash Drive or External HDD named...Bob to Mount it on Desktop.
Note...Any Files or Folders on either Drives will not be affected by the name change.
The Flash Drive/HDD now looks like this...

Plug in Flash Drive or External HDD...then type...Disks in Search Box and hit Enter.
Then Select...Flash Drive or External HDD...which will be at the bottom of list...click black square to Unmount...then click Cog Wheels...Select...Edit File System.
Then type new Name ie Bob...click ...Change...click Black triangle to Mount...done.
Go to Computer and Double click...Flash Drive or External HDD named...Bob to Mount it on Desktop.
Note...Any Files or Folders on either Drives will not be affected by the name change.
The Flash Drive/HDD now looks like this...
