Namechange Unavailable?

I know this will probably never end up reaching Riot but there is a problem when I try to change to name to anything with "Kassadin" in it. I'm a Kassadin main and I would just want everyone out there to know I am but I can't change my name to it probably because 'Kassadin" contains the word "a$$". I know you guys probably can't do anything about it but I'm just waiting to scratch off that rp card code.... and finally change my name...