Etymology and distribution of 國須.

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

Nagasaki-ken . Nagasaki-ken Sasebo-shi Origin of Kosaza town. The name of a place with a record in the notation of "Kosa" in the Nanboku morning era. Mr. Sasaki comes from Shiga-ken and tells that he became a place name with Kasane's surname. 佐々木 Sasaki reference.