Re: What's in a name? Let's use a (uuid,name,email) triplet

quoted

While a gnu.org or gmail.com will (most likely) stay with some
person forever, hindsight is 20/20 and many people may generate
his UUID from a work email.  So, suppose I make my UUID based
on[off-list ref]  what will guarantee that in 20 years I
won't find a new career as a bartender, and Red Hat wouldn't hire
someone with my same name, and give him the same email address?

Firstly, the UUID need not be a name/email pair.

That's what you lastly proposed generating it from.

Secondly, you're being ridiculous; even if that ridiculous scenario
played out not-infrequently

It's not a matter of frequency.  If you want a "UU" identification,
collisions must not even happen *once*.

quoted

I have an idea.  Start your own website uuidemail.com.  One
registers and gets an alias for their email, something like
8aacc35ffca0d34fccf8a750e84e3a81bdcb940b@uuidemail.com.  Then
people can start using
8aacc35ffca0d34fccf8a750e84e3a81bdcb940b+pbonzini--redhat.com@uuidemail.com
as their git user.email.  I bet nobody will.

This is nonsense that betrays your misunderstanding.

Why?  What does (name, email, uuid) provide over (name, concat(uuid, 
email))?  Nothing.

But the point is, neither really provides anything over (name, email).

Paolo