The real family name was Genji (Minamoto clan) and the family lineage originated from a branch family of the Ashikaga clan and Kira clan traced back to Kawachi-Genji (Minamoto clan) which was one of Seiwa-Genji (Minamoto clan).
本姓は源氏で、家系は清和源氏のひとつ河内源氏の流れを汲む足利氏一門・吉良家の分家にあたる。