Kira clan is one of the lineages of Ashikaga clan originated from MINAMOTO no Yoshikuni; since Yoshikuni was the son of Chinju-fu shogun (Commander-in-Chief of the Defense of the North) and the head of Kawachi-Genji clan (a lineage of Seiwa-Genji clan) MINAMOTO no Yoshiie, Kira clan traces its roots to Seiwa-Genji clan.
家系は清和源氏の一家系　河内源氏の棟梁　鎮守府将軍源義家の子　源義国を祖とする足利氏の一門吉良氏。