Ieyasu TOKUGAWA was originally from the Kamo clan, but he first referred to himself as Fujiwara, and then requested the Nitta clan rewrite the family tree and changed his family name to Minamoto.
徳川家康はもともとは賀茂氏であったが初め藤原氏を名乗り、のちに新田氏に依頼して系図を書き換え源氏に姓を変えたと言われている。