Last name דוקאס (Doukas 
, דוקאס 
) , throughout the world, is quite a common cognomen. The family name דוקאס is habitual in Greece, where it is quite a common surname, Albania, where it is quite a rare surname, and Australia, where it is a rare surname. Measured by absolute frequency, it is commonest in Greece, the United States, and Germany. Much less frequently, דוקאס is the forename as well as the last name.