Family name Diadio (Diadio 
) , worldwide, is a rare surname. The cognomen Diadio is characteristic of Philippines, where it is a rare surname, Brazil, where it is a very rare surname, and France, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Philippines, Brazil, and China. Very seldom, Diadio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diadio | Brazil, Philippines, China, France, Mauritania |