Principal English Translation: 

(the contraction of -tzine vocative)

Horacio Carochi / English: 

-tze = contraction of -tzine vocative
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), 44–45, 515.

Attestations from sources in English: 

Possibly the ending that led to formations such as Malinche.