Cognomen דיאו (Diaw 
, דיאו 
, Diavs) , all around the world, is a common surname. The cognomen דיאו is characteristic of Sub-Saharan Africa, particularly Senegal, where it is a common surname, Mauritania, where it is quite a common surname, and Gabon, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Senegal, France, and Mali. Much less frequently, דיאו is the forename as well as the last name.