What is "Boz" (as in Scaggs) short for, if anything?

True dat. Worth noting that that info was not in his wiki when this question was first asked.

What was irrelevant, in my opinion, referring to the drive-by bump, was that he popped in to say that he knew someone named “Borris,” whose nickname was “Boz.” And, even said, apparently without reading the previous responses:

So, he bumped it to let us that he has a friend named Borris, nicknamed “Boz.” Well, thanks for that information.

I knew a Barry who went by “Boz”.

Of course DJs can be wrong. I can’t tell you how many times I’ve heard Led Zeppelin’s “D’yer Mak’er” mispronounced.

I’ve gone all my life without even wondering what the correct pronunciation of that would be. In my head it’s just ‘dyer maker’. Enlighten me.

^ D'yer Mak'er - Wikipedia