Etymology and distribution of 顧朱.

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

Kyouto-fu . Terrain . Kyouto-fu Kyouto-shi Tells that Mr. Sanjo lived in the Nankoku-ku near Nishinokyo-tenocho-cho (formerly the west of Suzaku Odori in North of Sanjo Odori) during the North-South morning era. 三条 Sanjou reference.