Surname 怀云 (怀云 
, Huaiyun 
) , in the entire world, is a rare family name. The last name 怀云 is habitual in Eastern Asia, particularly China, where it is a very rare surname. More frequently, 怀云 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 怀云 | China |
| Huaiyun | United States |