The story
Unknown. A twentieth-century invention, possibly from a rare Irish surname of obscure meaning, possibly from Dara or Daragh, meaning "oak". It is also the name of an old silver mine near Aberystwyth, Wales. * The name became popular, particularly in the UK, because of a character in the 1960s American TV series Bewitched, actually spelled Darrin. * (person with sense of entitlement): As a rhyming equivalent for Karen.
Etymology from Wiktionary, CC BY-SA 4.0.