Surname المهدی (Almhdi 
, Sudanu 
, Al-Mahdi 
) , worldwide, is quite a rare cognomen. The cognomen المهدی is habitual in Sudan, where it is quite a rare surname, Bahrain, and Libya. Not in comparison with a country's population, it is commonest in Sudan, Saudi Arabia, and Egypt. Very seldom, المهدی is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Almhdi | Saudi Arabia, Yemen, Sudan, Syria, Egypt |
| Sudanu | India, Indonesia, Myanmar |
| Al-Mahdi | Saudi Arabia, Sudan, Egypt, Iraq, Bangladesh |
| المهدی | Sudan, Morocco, Egypt, Iran |