Call yourselves the "Sugar Babes" for a week, wait for a response from the Sugababes, then change it to "X Y Z...", where the letters represent the names of the members (e.g. "Perrie Jesy Jade Leigh-Anne" or something).
Is this a band as in drums, bass, guitar,keys etc or a vocal group who will sing to backing tracks, it's important to know, cos names for each type will be of a different style
There are always such names as the Four Cues or the Four Coughs.
I was a barbershop singer once upon a time and I sang in a chorus with a guy called Les Cannel. If only he had had 3 brothers we could have had the Four Cannels.