Why do we call them Generation Y?

People born before 1946 were called The Silent generation.
People born between 1946 and 1959 are called The Baby Boomers.
People born between 1960 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?
I always thought it was because they say.... you know;
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 a cartoonist explained it very eloquently below.

Link