Generation "Y"

People born before 1946 were called - The Greatest Generation.

People born between 1946 and 1964 are called - The Baby Boomers.

People born between 1965 and 1979 are called - Generation X.

And people born between 1980 and 2010 are called - Generation Y.

Why do we call the last group - Generation Y ?

Y should I get a job?
Y should I leave home and find my own place?
Y should I get a car when I can borrow yours?
Y should I clean my room?
Y should I wash and iron my own clothes?
Y should I buy any food?

But perhaps a cartoonist explained it most eloquently below...