Yoyontzin.

auh in ixtlilxochitzin yquac mic quiteneuhta in don Jorgen yohyontzin yn yehuatl tlatoani ez. auh ynic oaqui necocolo conilhuia intla miquiz don Jorgē aquī tlatoani ez quihto Ehuatl quimomachitia in tt.º. dios. yn aquī tlatoani yez. = And Ixtlilxochitzin, when he died, designated don Jorge Yoyontzin to be ruler. And since sickness was prevalent, he said that if don Jorge were to die, who would be ruler? He said only our Lord God knew who would be ruler. (central Mexico, early seventeenth century)
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 2, 200–202.

Injc matlactlj tlatoanj muchiuh tetzcuco iehoatl in ioiontzin in tlatocat cexiujtl. = The tenth who became ruler of Texcoco [was] Yoyontzin. He governed one year. (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 8 -- Kings and Lords, no. 14, Part IX, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1951), 10.

Yuyontzin (Carlos): "El que ambla." En las pinturas, algo bajo las nalgas parece indicar la causa de dicho movimiento Víctor M. Castillo F., "Relación Tepepulca de los señores de México Tenochtitlan y de Acolhuacan," Estudios de Cultura Náhuatl 11 (1974), 183–225, y ver la pág. 192.