Chadwick is a surname. I associate "surname as first name" with working-class Americans. Jackson is the classic example.

Trying to make this point without being an ass: could we all agree to use "NT" to mean "neurotypical" (by no means "extremely rare in the general population") rather than as a reference to Meyers-Briggs?
(For that matter, can people stop talking about Meyers-Briggs? Personalities don't work that way)