Surname ضیائی (ضیائی 
) , all over the world, is a rare cognomen. The family name ضیائی is habitual in Southern Asia, particularly Afghanistan, where it is a rare surname, and Iran, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ضیائی | Iran, Afghanistan |
| محمدناصر ضیائی Iranian cleric, IR (b. 1946) |
|