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