Etymology and distribution of 桒守.

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

Nagano-ken Nagano-shi . Thing . In Nagano-ken Nagano-shi Wakasato we add "branches" to Sato surname and tell them that they changed their name at the end of the Edo period. 佐藤 Satou reference.