Atoyac.

Headword: 
Atoyac.
Principal English Translation: 

a place name meaning at the river, in a river; atoyatl + locative (see attestations)

IPAspelling: 
ɑːtoːjɑːk
Attestations from sources in English: 

In Oaxaca, the Río Atoyac preserves the Nahuatl word for river (with a locative) and adds the Spanish word for river. This is a part of the Río Balsas.
https://en.wikipedia.org/wiki/Balsas_River

There is a type of pottery with "Atoyac yellow" or "yellow-white outleaned wall bowls" that comes from archaeological sites such as San José Mogote.
Kent V. Flannery and ‎Joyce Marcus, Excavations at San José Mogote 1: The Household Archaeology (2005).

The state of Guerrero has a municipality called Atoyac de Álvarez, and the states of Jalisco, Veracruz, and Oaxaca also have towns named Atoyac.
https://en.wikipedia.org/wiki/Atoyac

See also: