Additionally, the origin of the word of kira as Kiranosho of Mikawa Province, is said to be derived from the word 'kirara' (in yamato-kotoba [words of Japanese origi]) which is mica, since the clan had a mica mine within its shoen from long time ago.
なお、この三河国吉良荘の吉良の語源は、荘園内に雲母（大和言葉で「きらら」）の鉱山を古くから有したためにつけられたものと言われている。