Cognomen Диао (Diao 
, Диао 
) , across the world, is a widespread family name. The surname Диао is habitual in Senegal, where it is a common surname, Aland Islands, where it is quite a common surname, and Cayman Islands. In absolute terms, it is commonest in China, Senegal, and Philippines. Very seldom, Диао is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diao | China, Philippines, Senegal, Taiwan, Burkina Faso |
| Диао | Russia |