Diaprepes was the name of the youngest of the fifth pair of twins whom Plato records in Critias as the tenth king of the Atlantean confederation/alliance.
The Schoppes, based on a rather vague similarity of sound alone, have suggested that Diaprepes gave his name to the region of the River Dnieper, which flows into the Black Sea, where they claim Atlantis had been located.
Riaan Booysen provides a very different etymological interpretation of the name, proposing that it means something like “among [those who were] before everyone else”. David Hughes suggested in 2007 in The British Chronicles (Book I) that the province ruled by Diaprepes was Scandinavia.(a)