The birth of the Christ on 25th December is an occasion that calls for a celebration. People throughout the world celebrate His birth which is known as Christmas. The occasion of His birth is marked by immense joy and happiness and therefore, we tend to greet people with saying Merry Christmas. But have you ever thought that why is it called merry instead of happy Christmas? In fact why Christmas is the only occasion that is merry while others are not? After all, we dont wish people a Merry New Year. In fact, we dont even wish people a Merry Birthday as well. If you are intrigued to know why it is so then, read along.