Cognomen Seydu (سيدو 
, Seydu 
, Сейду 
) , in all the world, is quite a common last name. The cognomen Seydu is characteristic of Western Asia, particularly Syria, where it is quite a common surname, Lebanon, where it is quite a rare surname, and Jordan. Not in comparison with a country's population, this name is the most popular in Syria, Iraq, and Sudan. Very seldom, Seydu is the forename as well as the last name.