I like Xmas. It’s X’mas that I hate.
X’mas, Xmas, in English no apostrophe, please.
The word is really Christmas. ‘Christ’ refers to Jesus Christ, and ‘mas’ refers to mass, a holy celebration.
So why is Xmas sometimes used? It’s just a quick way of writing Christmas. Perhaps the writer is in a hurry, or there isn’t enough space for a longer word, or maybe someone needs a cheaper neon sign.
So does X mean Christ? Yes it does. In the Greek language Christ is written XPISTOS (sorry my font is incorrect, but this is pretty close). So X is the first letter of Christ.
An apostrophe is mainly used in two situations:
a) As ‘s, rather like の in Japanese, showing ownership or association, for example: Jim’s car. But be careful, in plural words ending in s the apostrophe comes after the s, for example: the students’ restaurant.
b) in place of missing letters. This often happens when two words are joined together and a letter (or letters) is dropped, for example: He’s my friend, rock ‘n’ roll, Hallowe’en.