Cognomen 癸龙 (癸龙 
) , in the world, is a very rare last name. The cognomen 癸龙 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 癸龙 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 癸龙 | China |