Etymology and distribution of 大佐々.

Oosasa 【大佐々】^{レベル3
About 80}  The Japanese surnames etymology dictionary.

Kagawa-ken . A variant of 逢坂 . Kagawa-ken Takamatsu-shi Tamamo-cho was in the Edo period in the Sanuki Takamatsu clan in the Clan office. The same samurai says that Nakayama Shiroyama of the same clan folk invented the character of "苧" in the Edo period. 逢坂 Ousaka reference.