Why is it "merry" christmas but "happy" new year?
Maybe it's because "merry" sounds more "festive" for the season than "happy" does. Happy New Year seems to imply "let's put the previous year behind us". Merry new year just doesn't sound right. Happy Christmas doesn't sound right either.
it's just tradition/ the way it is
Its just i guess a habit. We are so used to hearing MERRY christmas that happy christmas doesnt sound right