Originally he had the family name of "Haji," but in February 11, 791, Emperor Kanmu conferred "Oe no Ason" as the official status title on him, so his family name became Oe.
もと土師氏であったが、延暦9年12月30日(旧暦)（791年2月11日）に桓武天皇より「大枝朝臣」のカバネを授かって大枝氏となった。