Last name Didymos (Дидим 
, Didymos 
) , across the world, is a very rare family name. The cognomen Didymos is habitual in Greece, where it is a rare surname, Czechia, and Ukraine, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Greece, Czechia, and Nigeria. Very seldom, Didymos is the forename as well as the last name.