Names, again

[Wanda Sherratt]

No: HPFGUIDX 74949

I just noticed that when Malfoy interrupts the Occlumency lesson, 
Snape addresses him as "Draco".  Has he ever addressed a student by 
his given name before?  I don't remember that he has; even Draco he 
used to address as "Mr. Malfoy", or, I think, just "Malfoy", though 
that might have been when he was referring to him in the third 
person.  Is this significant?  I tend to notice when people do 
things one way for a long time, then do something different. I sort 
of hope it is; I'm not a big Draco fan, but I think that his 
character has stayed pretty one-note for 5 books, and it's about 
time something interesting happened to him.

Wanda