Cognomen Сайдум (Saidum 
, Сайдум 
, Saydum 
) , all over the world, is a rare last name. The cognomen Сайдум is habitual in Saudi Arabia, where it is a rare surname, Malaysia, and Thailand, where it is a very rare surname. Also, Сайдум is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Saidum | Saudi Arabia, Malaysia, Nigeria, Thailand, India |
| Сайдум | Russia, Ukraine |
| Saydum | United States, Thailand |