The Nahautl did not have a written language they used hieroglyphics. The sound of "ch" written in the Greco-Roman alphabet was put in place by the Spanish not the Nahautl.
Xicano is a First Generation way of Spelling Chicano.
Correct spelling for the word chicano.
In the Nahautl language the sound 'ch' is spelled with an X.
Don't call me Hispanic, I am Xicano.