In 1959, Yoshiharu - a younger brother of Hounsai, the 15th head of Urasenke - proposed changing his family name as a custom and was given permission, which was followed by others including Shojiro SAKAI and Masakazu IZUMI following suit.
1959年に裏千家十五代鵬雲斎の弟嘉治が慣例を理由に改姓を申し出、認められたことを皮切りに、左海祥二郎、伊住政和らが改姓している。