Ehecatl was a wind god in what mythology?

Ehecatl (Nahuatl: meaning 'Wind') was an Aztec god of the air and winds, especially those which brought rains.

Ehecatl features in the Aztec Creation mythology, first, as the 2nd sun of the cosmos Nahui Ehecatl, and then during the creation of the present world with the 5th and final sun. According to one version of the myth, Quetzalcoatl took on the guise of Ehecatl and descended into the Underworld where he stole the bones of the inhabitants of the former worlds in order to create humans in this one. Mictlantecuhtli, the god of the Underworld, was none too happy about people popping into his realm whenever they felt like it and so would only let Ehecatl go free if he could somehow get music from a conch shell. Ehecatl cleverly had worms bore holes in it and bees buzz inside it to produce a tremendous sound, thus ensuring his liberty.

Ehecatl also helped in the movement of the 5th sun and moon. These had been created when the twin brothers Nanahuatzin and Tecuciztecatl had thrown themselves into a sacrificial fire. The problem, though, was that neither celestial body could move and so Ehecatl, in one version at least, was called upon to blow them into their respective orbits.