Etymology and distribution of 杤山.

Tochiyama 【杤山】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Chiba-ken Sousa-shi . 菱木 's variant. It was in the Edo era in Chiba-ken Sousa-shi Temple. Tell him that he changed his pronunciation from Hijiki to Hiro at the same place. 菱木 Hishiki reference.