The Italian word that gives the meaning of this name is used in an Aria in the opera Aida by Giuseppe Vedri. The aria is Celeste Aida meaning heavenly Aida. I like the name because I like the aria, and because my father and grandfather also liked this aria.
Clay is a male MudWing, a Dragonet of Destiny, and the main protagonist in The Dragonet Prophecy, the very first book of the Wings of Fire series. Clay has fire-resistant scales, which he found out about when he pushed Peril down a tunnel as he tried to hide her from Queen Scarlet.
During the Mud Pack story arc where Basil Karlo works with the other Clayfaces Preston Payne and Sondra Fuller, he later injects himself with a compound made from their DNA, which gives him the ability to shapeshift, and declares himself the Ultimate Clayface.