Name my fish

I picked up two new fish this weekend: both pineapple swordtails, one big and female, the other small and male. I'd like to play on their size in naming them, but Sonny and Cher seems too easy.

I considered John and Margaret, after Jill's paternal grandparents, or Paul and Mary, after my Dad's maternal grandparents. Both couples fit the bill, but not having known three of the four, I'm not sure we're allowed such mockery.

Had the Pats won last night, they may have been Welker and Wilfork, but I think that's out of the question.

Any ideas?