alt Hacker NewsThey can spell/pronounce things differently than we do and it's all cool either way. It's very common for animals to have different spellings, pronunciations, or even completely different names between languages. If you add time and regional axes, the same variances can be true even when keeping with the same language!
I'm just explaining why it's written 'x' and pronounced [ʃ]. If it pleases people to knowingly mispronounce Nahuatl loan words, they can do so, but it seems rather silly given that [ʃ] is also in the phonemic inventory of English. What next? Are you going say 'fowks pass' for faux pas?