Dannara and Daennera could be altered forms of Deianira (Dayanara or Deyanira in Spanish, I believe), who was one of Herakles
's wives in Greek myth. Oxygen.com's Babynamer claims the name means "forceful killer" in Greek: http://snipurl.com/dcfj
Wikipedia has a shortish page on Deineira: http://snipurl.com/dcfk. Encyclopedia Mythica also has an article on her, but it's very brief: http://snipurl.com/achg.
"Multiple exclamation marks are a sure sign of diseased mind" -- Terry Pratchett
!!!!!!!!!! ← Maud, John, Alice, Peter, Emma, Edith, Lewis, Henry, Isabel, and Joseph