Cognomen Xmas (คริสต์มาส 
, Xmas 
) , in the world, is a rare surname. The cognomen Xmas is characteristic of Nigeria, where it is a very rare surname, Indonesia, and Thailand, where it is an extremely rare surname. In absolute terms, it is commonest in Nigeria, Indonesia, and China. More prevalently, Xmas is the forename as well as the last name.