Nicknames

[Carol]

No: HPFGUIDX 185565

Carol earlier:
><snip>
> > But as for "unlikely spur-of-the-moment choice," unlikely or not,
it *is* a spur-of-the-moment invention. 
> 
> Geoff:
> That, actually, is what I meant - that it was an "unlikely
spur-of-the-moment invention" - it was a name which they had used already.

Carol responds:

It can't possibly be a name they've used already. All three boys are
eleven years old and have just met--if you can call an unfriendly
chance encounter "meeting." In SWM, it's a name they've used before,
but in the Hogwarts Express encounter in "The Prince's Tale," Sirius
(or, less likely, james) is making it up on the spot.
> 
Carol earlier:
> > Neither James nor Sirius knows Severus. The only reason they know
 >his first name is that Lily uses it. 
> 
> Geoff:
> I think you're incorrect. <snip>
> 
> However, I think the following is the relevant piece of canon:
> 
> '"This'll liven you up, Padfoot" said James quietly. "Look who it is..."

Carol responds:

I see the source of confusion. Of course they knew who Severus was in
SWM. They'd had classes with him for five years, and "Snape" would
have stood out in a crowd. I'm talking about the first time Sirius (or
possibly James) used the name, in the Hogwarts Express when they were
all brand-new first-years.

Carol, who can't provide a page number for the Bloomsbury edition, but
it's in "The Prince's Tale"