Nintendo trademark new names!

It seems like Nintendo are having something of an identity crisis as they have reportedly submitted nine (count 'em) NINE possible acronyms for their upcoming Dual Screen gaming system:

DGB
EGB
GBD
GBE
GBN
GBY
TGB
WGB
XGB

The "G" and the "B" seem most likely to refer to "Game Boy" in some form or another, but the other letters seem to be more of a mystery. "D" easily could be "Dual", but the "T" and the "Y"? We open the floor to your most interesting suggestions on the subject!