I don't care for it. I don't care for
Morgan, and
Morrigan as some elements of it. I don't like the
organ part if it.
Morrigan also is very choppy sounding, and too surname-y for my liking (I like certain surnames as formal names, but not this one). It isn't masculine, and it isn't feminine, either (I feel that way about
Morgan, too). If it's a family name (or family surname), then I would suggest only using it as the middle name.