Hmm, thing is my name is based on two different charactrs of mine from AGES back so to have them referred to as one person with one of their names as a surname would be, well, 'off' so to speak. =p But say if the teacher confuses the students by claiming he is Bob and then later saying he is Bill, etc, that might work for you?
And 6, welly well. Ludicolo, Luxray, Rotom, Espeon, Umbreon and Houndoom will do then off the top of my list of favourites, Ludicolo being the 'favourite' just because. =p