It's a lot of individual tables because Santa's excel struggles with anything past a few hundred thousand rows. It's not just names, but addresses, lists of desires, and so on.
There are around 2 billion children. If you wonder why he skips so many children, it's not religion or poverty, it's because Santa's files got corrupted.
Santa already extrapolates data for children without lists but with generative AI, we're going to see new and exciting ways to disappoint children this Christmas!