Principal English Translation:
Horacio Carochi / English:
-īxcòtiān, -īxcòyān = one's self, one's own
Horacio Carochi, S.J., Grammar of the Mexican language with an explanation of its adverbs (1645), translated and edited with commentary by James Lockhart, UCLA Latin American Studies Volume 89 (Stanford: Stanford University Press, UCLA Latin American Center Publications, 2001), 504.
Attestations from sources in Spanish:
nixcotian notlatqui = los bienes que tengo son míos (Tepexi de la Seda, 1621)
Vidas y bienes olvidados: Testamentos en náhuatl y castellano del siglo XVII, vol. 3, Teresa Rojas Rabiela, et al, eds. (México: CIESAS, 2002), 116–117.