Cognomen Diob (Dyby 
, Diob 
) , across the world, is a rare family name. The cognomen Diob is characteristic of Senegal, where it is quite a rare surname, Syria, where it is a rare surname, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Senegal, Syria, and China. Very seldom, Diob is the forename as well as the last name.