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Last name دياو (Diao , Diaw , دياو) , globally, is a widespread family name. The last name دياو is characteristic of Senegal, where it is a common surname, Aland Islands, where it is quite a common surname, and Mauritania (explore the name in all countries). In absolute terms, it is commonest in China, Senegal, and France. Very seldom, دياو is the forename as well as the last name.