The two unnamed Gryffindor girls

[Catlady (Rita Prince Winston)]

No: HPFGUIDX 93628

THE JKR CHAT says:
"Adele: Who are the two "unknown Gryffindor girls" in Harry's year?
JK Rowling replies -> Oh, I've just understood what you mean. I
haven't got the notebook to hand and I can't remember! That's
terrible. I'll try and remember before the end of the chat!"

There is a photograph of that notebook page at
http://photos.groups.yahoo.com/group/hpforgrownups/lst?.dir=/Harry+Potter+%26+Me&.src=gr&.order=&.view=t&.done=http%3a//briefcase.yahoo.com/
but here is an easier way to click on it: http://tinyurl.com/kk8t

Helpful people transcribed it into posts (below); looking at the list
for girls whose House affiliation we don't know, I find Sally-Ann
Perks, whose name but not House was mentioned in the Sorting scene of
Book 1, and several students who don't even have first names: Moon,
??an, Rive, Rope, Runc, and Spink. 

Thanks to Muridae
http://groups.yahoo.com/group/HPforGrownups/message/32313

Abbott, Hannah (Hufflepuff)
Bones, Susan (Hufflepuff)
Boot, Trevor (Ravenclaw)
Brocklehurst, Mandy (Ravenclaw)
Brown, Lavender (Gryffindor)
Bulstrode, Millicent (Slytherin)
Corner, Michael (Hufflepuff)
Cornfoot, Stephen (Ravenclaw)
Crabbe, Vincent (Slytherin)
Davis, Tracey (Slytherin)
Entwhistle, Kevin (Ravenclaw)
Finch-Fletchley, Justin (Hufflepuff)
Finnigan, Seamus (Gryffindor)
Goldstein, Anthony (Hufflepuff)
Goyle, Gregory (Slytherin)
Granger, Hermione (Gryffindor)
Greengrass, Queenie???? (Slytherin) 
Hopkins, Wayne (Hufflepuff)
Jones, Megan (Hufflepuff)
Li, Su (Ravenclaw)
Longbottom, Neville (Gryffindor)
McDougal, Isabel (Ravenclaw)

Thanks to HOLLYDAZE!
http://groups.yahoo.com/group/HPforGrownups/message/32345

Abbott, Hannah.
Bones, Susan.
Boot, Trevor. (his name seems to have been changed to Terry in the books)
Brocklehurst, Mandy.
Brown, Lavender.
Bulstrode, Millicent.
Corner, Michael.
Cornfoot, Stephen.
Crabbe, Vincent.
Davis, Tracy.
Entwhistle, Kevin.
Finch-Fletchley, Justin.
Finnigan, Seamus.
Goldstein, Anthony.
Goyle, Gregory.
Granger, Hermione
Greingrass, Queenie [Daphne Greengrass, from OoP, Charms OWL]
Hopkins, Wayne.
Jones, Megan.
Li, Su.
Longbottom, Neville.
MacDougal, Isabel (the original name appears to have been Katrina as a 
                K...A...T and R are visible with what looks very like
an "I" next, the next
                letter is hidden by JK's finger as is part of the last
letter which appears
                to  be an A) 
                (Thankyou to Muridae for working most of those out)
The rest of the list
                seems  to be something along the lines of:
Mac(Dougal, Morag)?
Mac(Millan, Ernie)? (this one could be another "Mal" but it is more
likely to
                be a "Mac" unless JK really didn't remember to change
"Isabel" to "Morag" in
                which case Morag should be Isabel and the one above is
Ernie, leaving this
                one unknown)
Mal(foy, Draco)
Moo(n)
Nott [Theodore, Slytherin, from OoP]
Park(inson)
Patel (Padma)
Patel (Parvati)
Perks (Sally-Ann)
Potter (Harry)
?ran (as far as I can see, this one is illegible due to the three
crossings out below it)
Rive(can just be seen in the 2nd top photo but is not visible on
either of the
                other two due to a crossing out below it and being cut
off in the 1st top
                photo)
Rope(something as the E joins on to another letter that is not in the
picture)
Runc (Possible Runcorn)
Smith [Zacharias Smith, Hufflepuff, from OoP]
Spink(s...it is unclear if this is the full name as the S is half of
the page)
Thom(as, Dean)
Turpi(n, Lisa)
Weasl(ey, Ronald/Ron)
Zabini, (Blaise)