Earlier quoted context omitted.
> Plenty of upper- and middle-class babies with unique, or at least unusual, names. Such as? In my experience, upper and upper-middle class kids get common names, usually a bit on the conservative side, nothing that sticks out too much. Never crazy spelling, never unique names.
> Such as? In my experience upper and upper-middle class kids get common names, ... Never crazy spelling, never unique names. X Æ A-12 Musk? Never say never.
There is a big difference between uncommon names but with deep roots like the above mentioned Sixtus and completely unique names X Æ A-12.
The former is very common in the upper classes, the latter not so much.