Question

why is christmas called as x'mas

Answer 1

Xmas is a common abbreviation of the word Christmas. ... The "X" comes from the Greek letter Chi, which is the first letter of the Greek word Χριστός, which in English is "Christ". The "-mas" part is from the Latin-derived Old English word for Mass.

Answer 2

Chi (or X) is the first letter in the Greek word for Christ. In the early days of the Christian church, Christians used the letter X as a secret symbol to indicate their membership in the church to others. If youknow the Greek meaning of X,Xmas and Christmasessentially mean the same thing: Christ + mas = Christmas.