Family name أم كلثوم (أم كلثوم 
, Umm-Kulthum 
) , globally, is a rare last name. The family name أم كلثوم is habitual in Sudan, where it is a rare surname, Iraq, where it is a very rare surname, and Egypt. More frequently, أم كلثوم is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| أم كلثوم | Saudi Arabia, Sudan, Morocco, Egypt, Libya |
| Umm-Kulthum | Nigeria |
Kulsum, Umm Kulthum, and ام کلثوم