Etymology and distribution of 數山.

Kayama 【數山】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Ibaraki-ken , Hiroshima-ken . During the Azuchi-Momoyama period, Akita-ken Akita-shi Chiaki Park was in the Edo period in the clan of the Kubota of the Clan office during the Azuchi Momoyama period as the vassal of Mr. Satake based on Ibaraki-ken .