Margharetha: Babylonian -> daughter of the sea, child of light.

I doubt that the name is Akkadian or Babylonian in origin. Latin margarita means 'pearl' (which kinda explains why a nickname for Margaret is Peg) from Greek μαργαριτης (margaritēs) < μαργαρος (margaros) 'mother of pearl'.

Ceci n'est pas un seing.