Principal English Translation: 

oneself, one's own, personally (a necessarily possessed form; see Karttunen)

Orthographic Variants: 
Frances Karttunen: 

-NEHHUIYĀN necessarily possessed form, oneself, one's own, personally / mi propia (cosa), de mi propio (S for first person singular possessor) M also has the noun neuhyantli 'something personal, created of one's own will, voluntary.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 162.