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