Ron

Reason for hash name: Ah, in the words of Baldrick, "Listen carefully, I have a cunning plan..."

'Ron' is the shortened version of 'Aa-Ron', so if you take the 'Aa-' away, that's what you get. Of course that might imply that he started off as an 'AA' student but was subsequently downgraded; I couldn't possibly comment...but I'm sure Helen will...

Most likely to say: "Poppy!"

Least likely to say: 

What the hash think...