Family name Демпси (Dempsey 
, Dempsie 
, Демпси 
) , in the entire world, is a common last name. The surname Демпси is characteristic of Ireland, where it is a common surname, Australia, where it is quite a common surname, and Isle of Man (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, Ireland, and the United Kingdom. Very seldom, Демпси is the forename as well as the last name.