If you are using a GPT partition table, there are two labels involved and different filemanagers may show either label:
Partition Label
parted /dev/sdb name 1 MyBook
will rename the first partition on /dev/sdb to MyBook.
Filesystem Label
e2label /dev/sdb1 MyBook
will rename the filesystem label on ext2/3/4 installed on /dev/sdb1. Different utilites are needed for other filesystems.
MSDOS partition tables only have filesystem labels though.