Rename volume with bizarre name A MacBook Air with a SSD, the boot drive, name consisting of 220 double-quote characters.
MBA 2014 with Sierra 10.12.6 (not high sierra)
These did not work:

From a finder window, R-click in name column Dialog popup - &quot;The name  can't be used.  Try using a name with fewer characters, or with no punctuation marks&quot;
From finder window, sidebar - just to be exhaustive, same result
From the Info dialog.
From the terminal.

At the user home directory:  diskutil rename /Volumes/oldname  new name .  I get the message &quot;could not find disk for /Volumes&quot;.  I tried using single-quotes around oldname, but same result
diskutil rename lets you specify the original location in ways other than by name.
I think some variation on this will work for you: diskutil rename disk1s1 &quot;NewHDDName2&quot;
Running diskutil list first should let you figure out the identifier for the volume.