What should I name my 3 rats?

I adopted 3 female rats from my vet tech program at school, but Im having trouble deciding on a name for them. They are all white lab rats. So far I have Bubbles, Buttercup & Bubbles, Artemis, Aphrodite & Athena, and Glenda, Ursula & Madea (three witches from Macbeth). Any more suggestions? Thanks!