Seemingly unprovoked software corruption on external drive. Can I salvage?

I have an external disk on my Mojave system that seemingly had the volume name overwritten with another volume's name and now it won't mount and Disk Utility firstaid won't help. The problem may go deeper than the name overwrite. But I hope not.

I have an external enclosure containing two SATA drives I also have a "toaster" for dropping in other drives I have on my shelf. In the enclosure I have volumes "Drone Raw" and "Masters" - both mounted.

I pulled an older drive off the shelf also called "Masters" and dropped into the toaster. It mounted fine and I had two "Masters". I've done this before without incident.

Then something went awry and I am not exactly sure of the sequence. I think I unmounted the "Masters" in the enclosure. Maybe both. I can't be sure how I got here. But suddenly the Masters in the enclosure would not mount up at all.

When I used Disk Utility, it thinks that the volume name is now "Drone Raw" and it won't mount. The true "Drone Raw" mounts fine. If I try to mount Masters, it then shows two Drone Raw with one of them being unmounted.

The results of a First aid read:

"Repairing file system.

Volume is already unmounted.

Performing fsck_hfs -fy -x /dev/rdisk6s2

Checking Journaled HFS Plus volume.

Checking extents overflow file.

Checking catalog file.

Invalid sibling link

Rebuilding catalog B-tree.

The volume Drone Raw could not be repaired.

File system check exit code is 8.

Restoring the original state found as unmounted.

File system verify or repair failed.

Operation failed…"

I tried command line fsck_hfs -r and -f to no avail.

Is this drive hopelessly scrozzed? If so, more academically, why did this happen? I really wasn't doing anything creative or risky at the time.

Thanks for any help

Bill