Surname السر (السر 
, Alsr 
) , around the globe, is a common last name. The cognomen السر is characteristic of Sudan, where it is quite a common surname, Palestinian Territory, and Saudi Arabia, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Sudan, Saudi Arabia, and Egypt. Likewise, السر is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| السر | Saudi Arabia, Palestinian Territory, Sudan, Egypt, Libya |
| Alsr | Afghanistan, Sudan, Saudi Arabia |