The Popolocan languages should not be confused with the languages called Popoluca spoken in the state of Veracruz, which belong to the unrelated Mixe-Zoquean language family. The term comes from the Nahuatl language and means to speak unintelligibly, which is why Nahuatl speakers called several different unrelated languages "Popol?ca". The Nahuatl term was later adopted by the Spanish. The convention now is that the Oto-Manguean languages are referred to as "Popoloca" and the Mixe-Zoquean languages are referred to as "Popoluca", although the latter term is falling into disuse.
The Popolocan languages are subdivided into: