Family name دم (Dem 
, Dum 
, دم 
) , worldwide, is a common cognomen. The cognomen دم is characteristic of Bhutan, where it is a common surname, Gambia, where it is quite a common surname, and Mauritania, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Bhutan, India, and France. Also, دم is the forename as well as the last name.