Question - not disputing that this may well be the most common name now, but what was the reasoning behind the term?  I would have naturally guessed that it meant people born after 2000, but these people were born in some indeterminate time span before the millennium.  Does it signify people who were high school age when the millennium turned or something like that? We should get the etymology behind the term 'millennial' in a source and add it to the article, either way.  /talk/