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