Thanks guys!
The two of them are a serious destructive force- area rugs end up crumpled up in corners, curtains are pulled down, food and earrings are mysteriously found behind the toilet or in the closet- but I absolutely adore them.

Possum- Bing is short for Mr. Bingley from Pride and Prejudice- he reminds me of the really awkward red headed guy that played the character in the 2005 film.
I started calling the little female siamese Miss Thing because she was seriously sassy and that evolved into Thing Two, because she'll follow Bing around like his shadow. I thought about the names Simone [de Beauvoir], Jane [Bennett- from Pride and Prejudice] and Norma Jean, but can't settle on anything