Etymology and distribution of 桐石.

Kiriishi 【桐石】^{レベル3
About 300}  The Japanese surnames etymology dictionary.

Shimane-ken Izumo-shi · Kanagawa-ken · Toukyou-to . Personal name . Toukyou-to tells that he was renounced from the family name Kuya (Kuya) using "Hiroshi" because he worshiped Kukai (priest of Kyohei Daishi) of the Heian period monk. Estimated in the Edo period. 久家 Kuge reference.