PopSci estimates that Santa Claus would have to travel at an average speed of 5.083 million miles per hour based on a 24-hour cycle to hit each household on Christmas Eve. It bases this on 2.67 children per household, with a 75 million households worldwide. The speed of light is 671 million mph. So if we ever get there, presents for everyone.
Two of Santa's reindeer originally had different names. In the 1823 poem, A Visit from Saint Nicholas, which originally introduced the world to Santa's reindeer, two of the flying animals, had slightly different names according to Syracuse.com. Donner and Blitzen instead of Dunder and Blixem, the Dutch word for "thunder and lightning."