"Too many plosives," he says severely. "It's full of hard sounds. Also it's not a name someone gives a person and so maybe sometime you'll realize what it says about your self-esteem to anyone who's paying attention. And it sounds like suicide.* Aa, well, he's very good at making people start fighting, ne. Because whether or not he's sane in human terms, and whether you want to say it as deity or horseman or demon or whatever, he's an honest person and he's not mistaken about himself."
* Meaning, if Xel tries to say it, it's going to sound a lot like 'seppuku.'