> If you read his about page, "DJ" is his legal name, as-is, with no spaces. It's not an initialism or abbreviation for something else.

Not that it is really any of my business, but I wonder if that's always been his legal name, or if he changed it at some point. I can see how if someone is used to going by their initials, they might eventually decide it is more of their real name than their legal name is, and hence change their legal name to match their real one. Conversely, maybe that's actually the name his parents gave him.

OTOH, my mother's real name (what her family and friends call her) and her legal name have always been different. I asked her once if she ever thought of changing it, she told me she's lived her whole life with them being different – she's in her late 70s now – and doesn't see the point of trying to officially align them, the work involved would outweigh any benefit to her

Buzz Aldrin, the astronaut, was legally Edwin Aldrin up until the 2010s or so, when he was in his 80s. People had been calling him Buzz for decades, so I guess he figured why not.

Unrelated fact about Aldrin: his mother's maiden name was Moon. Bit of nominative determinism by proxy there.