Not sure the NBA can do much about a person legally changing their name, not unlike the NFL and Chad Johnson then Ocho Cinco then Johnson again. They can discourage the behavior. He certainly didn't act like someone who inadvertently hit someone with an elbow. As someone who has been on both the giving and receiving end of an inadvertent elbow on the basketball court, the usual reaction is something along the lines of, "You okay? Sorry, man." Not continuing on down court, then looking to pick a fight when confronted about it.

Bottom line is that he can can call himself anything he wants, he's still Ron Artest and has a lot of negative history.

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)