Santa is St Nicholas, no? Sounds Christian to me.

Saint Nicholas (Greek: ¢ãéïò Íéêüëáïò , Agios ["saint"] Nikolaos ["victory of the people"]) (270 - 6 December 346) is the common name for Nicholas of Myra, a saint and Bishop of Myra (Demre, in Lycia, part of modern-day Turkey). Because of the many miracles attributed to his intercession, he is also known as Nicholas the Wonderworker. He had a reputation for secret gift-giving, such as putting coins in the shoes of those who left them out for him, and thus became the model for Santa Claus, whose English name comes from the Dutch Sinterklaas[citation needed]. His reputation evolved among the faithful, as is common for early Christian saints.[3] In 1087, his relics were furtively translated to Bari, in southeastern Italy; for this reason, he is also known as, Nicholas of Bari.