Written on 28 May 2013. Posted in Origin of Phrases - X. Xmas A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z Origin of Phrases - X Xmas X has been recognized as a standard abbreviation for Christ since before the year 1100. The X represents chi, the first letter of Christ's name when spelled in Greek (XRICTOC, pronounced Christos). Hits: 1945 Prev