Reese Witherspoon
The "Legally Blonde" actress uses one of her two middle names professionally. She was born Laura Jeanne Reese Witherspoon. She adopted her mother's maiden name as her first name and goes by that in all of her films.
Emma Stone
The "La La Land" actress had to rebrand herself at 16 years old. She was born Emily Jean Stone, and there was already an Emily Stone in Hollywood. "I changed it to Emma because you know it's closer to Emily, but most people call me 'M,' that know me well," she explained.