I saw the explanation on twitter but I can only remember that the 'A-12' bit is named after their (Elon and Shelon's) favourite aircraft. It's a really cool plane, but it's not cool to name your child like they're a machine.

But maybe Elon wants the child to be bullied, so they will grow up to be a super villain. A villain that will one day rule Mars and launch an attack on their birth planet that they came to despise. Earth will then be forced to unite against a common enemy. Genius. Not quite teleporting a giant squid monster into New York, but I think that's beyond even Mr. Musk's capabilities.