Allow renaming LVM Volume Groups
This operation can also be done for RAID, so I think that this task should be for Volume Groups in general instead of only for LVM.
In the case of mdadm, you can rename arrays calling this command:
mdadm --assemble /dev/md/alpha --name=alpha --update=name /dev/sdX
Where "/dev/md/alpha" will be changed for the desired device node, "--name" parameter should be followed by the device name (alpha in the example) and /dev/sdX should be changed for the physical device list.