Ji, my sister plays roller derby (youtube it if you don't know what it is) and she needs a "roller derby name" these are usually a play on words or just a funny saying/name. some examples are;
No bexcuses
D-Manding
Tap Arse
Anna Hath Her Way
Barrie De Hatchet
Eve.L Hart
Her name is Jessica Warrington, some ideas shes had so far are;
Woody Would Deck'her
Final Jestination
DieJestive Biscuit
Bertie Bashett
Block and Deck'her
Roller derby is a very rough contact sport hence some of the names, they must have an element of 'Grrr' to them and they should ideally be witty.