Merry christmas first appeared in the letters of the Catholic Church leaders in Rome, England. Later, among the British naval generals, "Merry Christmas" became a custom.

In 1843, the word MerryChristmas appeared many times in a novella A Christmas Carol published by Charles Dickens. Since the book was published, it has never been out of print, and it has become a Christmas Bible on the shelves of two families in Britain and America.

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The reason why Christmas is abbreviated as Xmas:

In ancient Greek, "Christ Christ" was written as χ ρ ι τ? In Latin, it became Christus, but in English it evolved into the writing of Christ. X in ancient Greek is pronounced "chi".

There is also a saying that it should be pronounced? /ka? /,both X and chi can perfectly correspond to Christ- Christ, so it is logical to use "X" instead of Christ. Xmas is read by some people, right? /'eksm? s/? , but most people still read it? /? kr? sm? S/, which is also a more conventional pronunciation.