How did JK Rowling come upi with the name Voldemort?

Answer 1

Actually, the dark lord's real name is Tom Marvolo Riddle. when he was older, he had gone through many transformations to look the way he is now and rearranged the letters in his name that would make people afraid of saying it when he became the greatest sorcerer in the world. (As seen in Harry Potter and the chamber of secrets)

Answer 2

J.K. Rowling has stated that she derived the name Voldemort from the French words "vol de mort," which roughly translates to "flight of death" or "theft of death." This name reflects Voldemort's character as the Dark Lord seeking to conquer death and achieve immortality.