In 2011 Ron Artest legally changed his name to what?

In 2011, Ron Artest legally changed his name to Metta World Peace.

A Los Angeles County court approved the change on September 16, 2011, while he was playing for the Los Angeles Lakers. Artest said the new name was intended to inspire people and promote peace, particularly among young people. “Metta” refers to a Buddhist concept associated with loving-kindness, friendliness, and goodwill toward others.

The change became one of the most memorable identity shifts in NBA history because Artest was already widely known as a tough, highly competitive defender. He had also been a central figure in the 2004 Pacers–Pistons brawl, often called the Malice at the Palace, making the peaceful new name especially striking to sports fans.

Metta World Peace later won another round of headlines when he changed his name again in 2020 to Metta Sandiford-Artest. That later change does not alter the answer to the 2011 question: the legal name adopted then was Metta World Peace.