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