> Third-party peripherals usually do not have this functionality.
What do you mean by ”usually” here?
I’m certain all the regular name brands, eg JBL Bose Sonos B&O etc enable the device itself to be configured with a user set name via their app. I’m certain because I’ve used them and done so.
I've never had a bose device that allowed this - is that new? And for JBL, it's only the latest gen (or maybe starting with gen 3?) that started allowing it.
As for other brands I own: Jlab, jawbone, pyle, and anker don't seem to have any such functionality that I can see.
So it's far from ubiquitous, sufficiently so that it makes no sense to presume that a bluetooth name is a message from a passenger and can be understood to have any intended meaning.