There seem to be more than 1 artists that go by the name of Morrigan 1. A German two-man Black Metal band, formed by ex-members of Mayhemic Truth. The band is still active and doing concerts.
2. A Japanese solo artist who works with the "WAVE" doujin circle. Mainly produces touhou arranges.
3. A German (Fulda, Hesse) Melodic Power Metal band formed in 1997,now split-up.(http://www.metal-archives.com/band.php?id=1667)
4. A vocal trio from Seattle specializing in nautical songs.