Nina (Asylum of the Daleks)
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Nina was a girl whom Oswin Oswald fancied, or possibly even dated. Oswin stated that she was "going through a phase," because Nina also possibly went by the first name Rory.
While shipwrecked on the ship Alaska in the Dalek Asylum, Oswin told Rory Williams about her, and began calling him "Nina," after her, because of Nina's shared first name with Rory Williams. (TV: Asylum of the Daleks)