By the way, I fixed my disk renaming problem, tho it wasted me well over an hour. The trick was to ignore "partition name" and use "partition label". To do this I had to go into "gnome-disks" and use a hidden menu, accessed by clicking an icon of a triangle inside of a square. Frustratingly, there was also a menu item in gparted for "label file system", but it was grayed out. I don't know why.
I think I might not actually be using a desktop operating system.