DSD. Differences in Sexual Development. About as common as being born with red hair, at least according to this article that I thought appeared to be pretty good.
What is a DSD? The condition at the heart of the Olympic boxing controversy and the Imane Khelif bout | Daily Mail Online
The Russians also said Brittany Griner was a male. After seeing photos of her playing topless, I agreed. Now, however, my guess is she's one of those born with DSD.