Family name Дьяко (Diaco 
, Дьяко 
) , around the globe, is quite a rare cognomen. The family name Дьяко is habitual in Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Switzerland. Measured by absolute frequency, it is commonest in Italy, Argentina, and the United States. Very seldom, Дьяко is the forename as well as the last name.