Morgan le
Fay is a female character in Arthurian myth dating back hundreds of years if not more than a thousand. Spelt in any number of ways, it appeared as
Morgan fairly early on.
Morgan as a male name, however, is a transferred Welsh surname and hasn't been used as a fn for anything like as long.
I'll be honest though. I absolutely hate it either way...
http://www.behindthename.com/pnl/167578