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I think a lot of it is Mormons[1].

[1]: https://digitalcommons.usu.edu/etd/1406/

I'm going to take a not completely insane guess and say that it's an odd outcome of everyone going by their personal (usually first) name. Instead of 10 Jasons, each with a different family name, you get 10 different spellings of Jason and never know the family names.

It's going to be even better, we'll get to see situations like Justice Jaxtyn leading the supreme court.

Then again, names change over time. Only a matter of time before some poor kid is getting bullied because his parents named him an ancient millennial name like Steve.