Cognomen 乃肝 (乃肝 
) , in all the world, is a very rare family name. The family name 乃肝 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 乃肝 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 乃肝 | China |