He keeps her old name

Mark thought for a moment. He actually liked the name "Wanda" so he decided to keep it for her.

"Your name is Wanda." Mark said to Wanda.

"Right! My name is Wanda!" Wanda exclaimed. Mark then looked at Natasha, who was still bobbing up and down on his cock.

"Natasha, stop and stand at attention!" Mark commanded. Natasha stood right up at attention, next to Wanda.