Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CHRISTMAS
As described in historical dictionaries
Patronymica Britannica (1860)
CHRISTMAS. CHRISIIAS. Originally imjiosed, Camden thinks, as a baptismal name, in consequence of the individual having been l:(orn on the daj' of the festival. In like manner in France, Noel was first a Christian, afterwards a family name.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English