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Tecayehuatl.

Headword: 
Tecayehuatl.
Principal English Translation: 

a person's name (attested as male); a headless or crazy madman (see attestations)

Orthographic Variants: 
Tecayevatl
Attestations from sources in English: 

See an image that represents Tecayehuatl in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present).

tecayehuatl = a crazy or headless madman
Gran Diccionario Náhuatl, citing a BnF manuscript (361, f. 453) from c. 1780 studied by Marc Thouvenot; https://gdn.iib.unam.mx/diccionario/tecayehua/236069

ytoca tecayevatl = named Tecayehuatl (husband of Teicuh) (Cuernavaca region, ca. 1540s)
The Book of Tributes: Early Sixteenth-Century Nahuatl Censuses from Morelos, ed. and transl. S. L. Cline, (Los Angeles: UCLA Latin American Center Publications, 1993), 146–147.

Attestations from sources in Spanish: 

tecayehuatl = descalabazado ô loco desatinado
Gran Diccionario Náhuatl, citing a BnF manuscript (361, f. 453) from c. 1780 studied by Marc Thouvenot; https://gdn.iib.unam.mx/diccionario/tecayehua/236069