Cognomen Hadaia (Hadaia 
, Хадая 
) , worldwide, is a very rare family name. The cognomen Hadaia is characteristic of Russia, where it is an extremely rare surname, Venezuela, and Mexico. More frequently, Hadaia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hadaia | Mexico, Egypt, United States, Venezuela |
| Хадая | Russia |