Surname Дейка (Dejka 
, Дейка 
) , worldwide, is a very rare family name. The cognomen Дейка is habitual in Bulgaria, where it is a rare surname, Kazakhstan, where it is a very rare surname, and the United States, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Bulgaria, the United States, and India. More prevalently, Дейка is the forename as well as the last name.