William Plotnikov , a Dagestan insurgent fighting in the Russian region , was killed in May 2012 . CNN filed forms seeking use the fighter 's last name as his first name . Official to Tamerlan Tsarnaev : `` There 's no evidence why he wanted to change his name ''
Emir Muaz , a Dagestan insurgent fighting in the Caucasus region , was killed in 2009 . Tamerlan Tsarnaev filed forms seeking use the fighter 's last name as his first name . Official to CNN : `` There 's no evidence why he wanted to change his name ''