Whats the matter with you man?  get a grip with yourself!  Let me explain how this works.  Aroras are a sub-group of Khatris.  Many Khatris do not recognize them as being Khatri because history shows that Aroras migrated from a different part of India (more then likely, centuries ago from the Sindh and the Multan area), and when they settled in the higher north Punjabi regions, the Khatris did not associate the Aroras with themselves, and called them Arora.