I think Ellen is lovely and underused - it's not trendy at all. I would use it as a first name, but it works with either. Elanor is ok, but I would use the spelling Elanor as a mn, and Elinor or Eleanor as a fn.
Ellen Cassandra
Ellen Virginia
Ellen Ophelia
Ellen Calanthe
Ellen Catherine
Ellen Penelope
Ellen Regina
Ellen Magdalena
Ellen Guinevere