A thought occurred to me after I found out about the existence of Treacher-Collins syndrome. To put it shortly, it’s a birth defect that makes a person’s face look unusual and can cause problems with hearing, breathing and seeing due to that.
People born with similar birth defects would most likely be assumed to be some sort of devil by the population at large and maybe the academia and the occult with right tools would be able to tell that it’s not the case.
Which leads to the concept of a character who says their a Tycherosi because that’s easier to explain then that they were born with an odd face that isn’t mystically caused.