After he gained his powers, he changed his name to Lord Vader.
変更名 change name, name change
彼女は結婚した後、彼女の名前を変更しました。
After she was married, she changed her name.
誰かに隠れるように名前を変えました。
I had my name changed to hide from someone.
彼は力を得た後、彼の名前をベイダーLordに変えました。
After he gained his powers,
he changed his name to Lord Vader.