| Abbreviation | Definition |
|---|---|
| CJ | Cyndi Jean |
| CJL | Christopher J. Lee |
| CK | California King |
| CK | California Kris |
| CK | Canoe Kitty |
| CK | Carlos King |
| CK | Carolina Kitten |
| CK | Charles K |
| CK | Chicken Killer |
| CK | Chris Kirkpatrick |
| CK | Chris Kosachuk |
| CK | Chris Kringle |
| CK | Christine Kreuzpaintner |
| CK | Cindy Knock |
| CK | Clare Keller |
| CK | Colin Keller |
| CK | Commuter Kate |
| CK | Coon Kitty |
| CK | Crystal Knight |
| CL | Clarence Leo |