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