Clay
Claymore
Clea
Cleatis
Clem
Clem Bob
Clem Bob, the Arkansas Barn Cat
Clementine
Cleo
Cleocatra
Cleopatchie
Cleopatra
Cleveland
Cliché
Click
Clide
Cliff
Cliffhanger
Clifford
Cliffy
Clifton
Climber
Cling
Clinger
Clinkers
Clint
Clint Eastwood
Clio
Clipper
Cliquot (after Veuve-Cliquot, a champagne brandname)