JennLin22 - The brown theme is a good idea. I love the first 3 names you said (Sienna, cinnamon, and fudge). Fudge is really cute! Thanks for the ideas!
Sammy H - My friend is coming this weekend to pick out 2 of the girls so I'm not sure which girl I'll get to keep yet. The boys act a lot alike, there are only a few differences that I've noticed so far.
The one boy is a little more shy, smaller, and he bites

(like his daddy Nibbles) I was thinking Nippers would be a cute name?
The other boy is a little bit bigger and he explores more.
Most of the time when I have the boys out I put them in the cage with the dad (the cage they can still escape from!) so mostly they're climbing out and I'm putting them back in constantly (Maybe I could name one of them Ninja - quiet, sneaky, and always up to something naughty!). When they aren't with they're dad, they're with their 3 sisters and mom in a room and its hard to tell them apart from the girls while they're running around and playing.
So far my options for boy names are: Nippers and Ninja (I was looking around for Ni- names to be like they're dad Nibbles), and Beebs (I call the dad Nibs for short sometimes)
So far my options for girl names are: Sqeak (Squeeks) and Squeakers (Squ- names like her mom Squirt), Sienna, Cinnamon, and Fudge. (I'll probably pick a name for her when I know which one I get to keep!)
What do you guys think of these names? Any other suggestions?