Cognomen Dydyk (Dydyk 
, Дидык 
, Дидик 
) , in all the world, is quite a rare family name. The last name Dydyk is habitual in Belarus, where it is quite a rare surname, Estonia, and Ukraine. In absolute terms, it is the most numerous in Russia, Ukraine, and Kazakhstan. Much less frequently, Dydyk is the forename as well as the last name.