If an owner has a racehorse named Christmas, the surprises and potential joys are there every day, not just once a twelvemonth.
From my search today, there have been at least three American-bred Thoroughbreds named Christmas. The oldest I found was Christmas (1896 by Patron), then Christmas (1970 by Tibaldo), and the most recent Christmas (1996 by Light Years).
Other countries have Christmas (horses) also. Japan, England, and Argentina all have Thoroughbreds registered as Christmas. For my money, the best named of all this lot is the English-bred Christmas of 1967 (by Santa Claus out of Babble On). Too punny.
May your season be bright and may all of your Christmases be fast.