Cognomen Сеыид (Seyid 
, Сеыид 
) , in the entire world, is a common last name. The cognomen Сеыид is characteristic of Ethiopia, where it is quite a common surname, Mauritania, where it is quite a rare surname, and Saudi Arabia. More frequently, Сеыид is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Seyid | Ethiopia, Saudi Arabia, Sudan, Mauritania, India |
| Сеыид | Russia |