something western or from the west (see Molina); literally, the sun's setting place
Orthographic Variants:
tonatiuh ycalaquianyotl
Alonso de Molina:
tonatiuh ycalaquianyotl. cosa occidental o del poniente. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 149v. col. 1. Thanks to Joe Campbell for providing the transcription.