Robin Hobb (alias Megan Lindholm, alias whatever her real name is if it isn't Megan Lindholm)

Margaret Astrid Lindholm Ogden. She doesn't put her real name in her books at all (I had to look it up on on the internet), although the (fairly new) book of hers that I happen to have on hand does list both pseudonyms in the "About the Author" section, which seems a little bit odd... I'll have to check and see if her older books do that.