To be clear, Negga's RL last name is Negga, thus the name. And I would know this because he donated to me via paypal for our teamspeak fund.
However, back to Badplayer's request--yes it's offensive and due to former precedents it is bannable/force name-change. Considering, as someone else pointed out, Rape was told to change his name many times. This should be no different.