- clayA mineral substance made up of small crystals of silica and alumina, that is ductile when moist; the material of pre-fired ceramics.
- ClaytonA town, the county seat of Barbour County, Alabama; named for Georgia jurist and congressman Augustin Smith Clayton.
- clayeyComposed of clay or containing (much) clay; clayish.
- cleyA claw.
- ClaycombA surname from Old English.