C.M. Weimer quotes Cicero's Orator, 153, in this answer:
How was the name of your ancestor changed from Axilla to Ala except from a desire to avoid a harsh-sounding letter? The same letter is removed by refined Latin speech from maxillae, taxilli, vexillum and pauxillum.
This comes to me as quite a surprise. I had understood that maxilla is a diminutive form of māla; see, for example, etymonline. Wouldn't dropping the x undo the diminutive? If the Romans dropped the x, what would the result be? Māilla? Māla? Wouldn't this cause confusion? Aren't there already too many homonyms clashing over māla?