it originated from when, the fourth son of the Ashikaga clan Yoshitugu settled his home base at Kiranosho in Mikawa Province, the same as his older brother Osauji, and then he commenced calling himself, 'Kira.'
足利義氏の四男・義継が、兄長氏と同じく三河国吉良荘を本拠とし、「吉良」を名乗りとしたことに始まる。