There’s a story about the Macintosh SE and the SE/30. Had Apple followed the conventions of the Macintosh II series, the SE/30 would have been the SEx. I’ve heard someone suggest that if Apple were a European company, they probably would have ran with it.
Sounds sort of like what Musk was looking to do with the Tesla. The Model 3 was originally going to be the Model E which would've made the Tesla lineup at the time, Model S, Model E and Model X. Adding the Model Y a few years later would've resulted in a S...E...X...Y model line.