Akihiro-o's family name was originally Minamoto, and he was the first person to get back the family name of O on becoming Jingi haku and then take back the family name of Minamoto after retirement.
顕広王は本来は源氏であり、神祇伯就任とともに王氏に復し、退任後に源氏に戻る最初の例となっている。