Cognomen Dadah (Dag 
, Dach 
, Dadah 
) , all around the world, is a common surname. The family name Dadah is habitual in Aruba, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Mauritania. Not in comparison with a country's population, it is the most numerous in Germany, Turkey, and France. Also, Dadah is the forename as well as the last name.