Cognomen Demiu (Demi 
, Demiu 
) , in the world, is quite a common surname. The last name Demiu is habitual in Albania, where it is quite a common surname, Kosovo, and Italy, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Italy, Indonesia, and Albania. More prevalently, Demiu is the forename as well as the last name.