The name Muirgen is a girl's name of Irish origin meaning "born of the sea". Muirgen and is often added to lists like Irish Baby Names for Girls and discussed in our forums with posts like "Picky Parents BNG".
From the experts:
Muirgen in Irish mythology was turned into a mermaid and then brought back to land after 300 years and transformed back into a woman -- which must have been quite a shock. Muirgen's original name was Liban. Muirgen may also be spelled Muireann or Muirenn.