Huehuetlan.

a place name; e.g. Nuestra Señora de La Piedad Huehuetlan, a part of Mexico City

(central Mexico, 1613)
see Annals of His Time: Don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, James Lockhart, Susan Schroeder, and Doris Namala, eds. and transl. (Stanford: Stanford University Press, 2006), 256–257.