The drama between Blac Chyna and the Kardashian family seemed to calm down considerably after the birth of Rob Kardashian's and Chyna's baby, Dream. However, things are stirring again as Chyna is looking to change her name legally to Kardashian and put a trademark on the name. The Kardashian sisters are fighting back saying in legal documents obtained by TMZ that if Chyna is allowed to go through with her plan they will " ?suffer damage including irreparable injury to their reputation and goodwill.?