We were going to name them W, A, S, and D (gamers will get it!), but that has since changed. The four are now Zim, Gir, Dib, and Gaz.
By the way, if there's anyone here, locally, that would like some mice, maxomai and skeletoncrew have four more, all males, and all very sociable and adorable. So, like, speak up.