Seiishi 【清石】3 The Japanese surnames etymology dictionary.
Yamaguchi-ken · Oosaka-fu · Kyouto-fu . Thing . Yamaguchi-ken Kumage-gun Kaminoseki-chou Meiji New surname by monk of Ilikodera of Jodo Shinshu in Nagashima. "Ri" and "mountain" are used from the well mountain valley of the same temple. It tells that the temple was founded by the descendant of the samurai of the mountain surname who came from Oosaka-fu Ikeda-shi around 1473 (5th year of civilization) and 1474 (civilization 6th year).