Where does “чэ” come from?

чэ (Mongolian) comes from Russian че, from Russian чего́ — what for? why?.

Ancestry of “чэ”, step by step

StepLanguageWordMeaning
1RussianчеThe Cyrillic letter Ч, ч
2Russianчего́what for? why?
Every word from Russian чего́ →Every word from Russian че →