The most common first names for Santa Claus are:
Kris (Kris Kringle) - According to legend this was Santa Claus' original name before he took on the task of being the official toymaker for Christmas.
Nicholas - in some religions the original Santa Claus was believed to have been a monk who later became Saint Nicholas. Santa Claus is a shortened form of this name.
This would be an excellent question to ask Santa when you send your letter to him this year.
