> I know for certain if you change the setting General > About > Name in an iPhone it changes what everyone sees when they look at their list of available Bluetooth devices.
> I assume other Bluetooth devices are the same, no?
No. The iPhone is allowing you to configure what name it broadcasts. But you cannot just tell another device what to broadcast. That device must have its own mechanism for changing its name.
For example, many Apple wireless peripherals can rename themselves after your user account once you connect them at least once. That has to be a function of the peripheral though, it's not performed by the device you connect it to (past telling the peripheral the new name, of course). Third-party peripherals usually do not have this functionality.
> 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.