Last name هاديا (Hadia 
, Hadja 
, هاديا 
) , all around the world, is a common cognomen. The family name هاديا is habitual in Cameroon, where it is quite a common surname, Libya, where it is quite a rare surname, and Israel. In absolute terms, it is the most numerous in Cameroon, Algeria, and Ethiopia. More frequently, هاديا is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hadia | Tanzania, Sudan, India, Algeria, Egypt |
| Hadja | Tanzania, India, Cameroon, Algeria, Guinea |
| هاديا | Iraq, Saudi Arabia, Palestinian Territory, Syria |