tocayo.

Headword: 
tocayo.
Principal English Translation: 

a signed document; or, one's namesake (see Karttunen)

Orthographic Variants: 
tōcāyoh
IPAspelling: 
toːkɑːyoh
Alonso de Molina: 

tocayo. firmada escriptura.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 148r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

TŌCĀYOH a signed document, or one's namesake / firmada escritura (M), su tocayo, su nombre (T for possessed form) [(1)Tp.135]. The single attestation is ambiguous between TŌCĀYOH and TŌCĀYŌ, but the sense appropriate to TŌCĀYOH 'something invested with a name' seems to agree with both M's gloss and with tocayo as it has been absorbed into Mexican Spanish as 'namesake.' See TŌCĀ(I)-TL, -YOH.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 242.