is Santa Claus /etc real?

Some mythology supports the Norse god Odin to be origins for Santa Claus lore, he would ride Sleipnir the 8 legged horse to bring gifts and blessings for Yule. 8 legs got traded out for 8 reindeer, and it went from stuffing socks with hay for Sleipnir to leaving out cookies and milk. That's one theory I've heard, however any time I've seen that I never saw an additional reference to Krampus having any origins in Norse lore.

There are also some who speculate ideas of the Saint are combined with aspects of Sami culture, citing things such as the importance of reindeer to him and their prevalence in Sami religion.