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Cain and Abel (so tongue-in-cheek, but I do have a brother Kain and love Abel enough to use it on a son)
Aurora (dawn) and Layla (night)
Blanche or Bianca (white, fair) and Melanie (black, dark)
Cecilia (blind) and Aisling (dream/vision -- not quite an opposite, but it works)
Liahona (compass) and Diggory (lost one)