Calvin Rensch discusses a word for "money" in Proto-Mixtecan (Central Mexican language, c. 1000 BC); also had the meaning of "bright" and "shining."
Calvin Rensch, Comparative Otomanguean Phonology (Bloomington: Indiana University, 1976): 266-267
Set 245 ** (n) si1/2
PMn 23 Θi-'mim32 : M-SM, M-SE, M-J, M-M, šụ3'ụ1 money, bit, M-SM, M-SE, M-M šụ1 bright, shining; T zạ3'ạhạ43 money, . . .