Clay \c-lay\ as a boy's name is of Old English origin. Occupational or place name involving clay; short form of Clayton. Clay that occurs naturally in the earth was a valued natural resource in earlier times. Boxing champion Muhammad Ali was named Cassius Clay after a 19th-century abolitionist, American statesman Henry Clay.
Clay has 1 variant form: Klay.
For more information, see also the related name Clayborne.