There was a judge in the UK, in the 1950s I think, whose name was Christmas Humphreys ... and he was a Buddhist. Perhaps if you go to work in a wig and robes you can carry it off, but Christmas the bus driver or Christmas the dinner lady would be dire indeed. I would think that their parents were more interested in making a personal statement than in the future happiness of their child. And I'd also wonder what they would name a second child - Boxing Day?