There's no such language as Mexican Indian. Mexico recognizes 63 Amerindian languages, including Nahuatl, Yucatec Maya, Mixtec, Zapotec, Tzeltal Maya, Tzotzil Maya and Otomi.

the most common language in Mexico is the Nahuatl language. Then comes Yucatec Maya; followed by Mixtec, Zapotec, and finally, Tzeltal Maya. Answers found on Wikipedia on Languages of Mexico in Indigenous Languages of Mexico. facts were found by how many speakers there were

Henning Siverts has written:

'Oxchujk'' -- subject(s): Social life and customs, Tzeltal Indians

'Oxchuc'

Jacinto Arias has written:

'El mundo numinoso de los mayas' -- subject(s): Acculturation, Case studies, Tzeltal Indians, Tzotzil Indians

In addition to Spanish, the de-facto language spoken by 92.7% of the Mexican population, 63 Amerindian languages are recognized as national languages; these include Nahuatl, Yucatec Maya, Mixtec, Zapotec,Tzeltal Maya, Tzotzil Maya and Otomi. It is estimated 5.7% of the population speaks any one of these languages besides Spanish and 0.8% speaks only one of these Amerindian languages.