[Ask ] Xmas or X'mas

[XiJun (噓人者人恆噓之)]

My classmate argued with me about the spelling of X'mas. He said that
it should be Xmas because it was from the Greek word. But I don't agree with
him. Who can tell me which is right which is wrong?

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→ XiJun:I know that X stands for Christ, but why X'mas is wrong?
→ naze:you could take look at #1667 or go to "ask board" #367