How to change  hostname in kali linux live with persistence 
1.frist all of open terminal in kali  linux 

 2. after type cd  space /etc ( cd /etc) and press enter

 3. after then type ls command (ls)

4. aften then type leafpad hostname  open in text editor (like thats leafpad , nano)

 5.your hostname open in leafpad text editor replace "kali " and add anyware name 

 5.after restart your pc  and fun