When they give you a list that lets you ban people it should be tracking their account name behind the scenes.
When multiple aliases come around I can finally start using gimmick names! My old Dota handle Boots1stisNOOB was a crowd favorite. I'm thinking:
RegulusPlusWingsisNOOB
WhyistherealwaysaRook
SnipeSpammingFromTheCrystal
SuperSpeedSila
and many more!