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