Etymology and distribution of 張趙.

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

Niigata-ken , Gunma-ken , Toukyou-to . In Tochigi-ken , distribution including Nanmo.

① Niigata-ken Tookamachi-shi Origin of Nanuni. Place name unknown record era. A place of comparison in tradition. Niigata-ken Tsubame-shi In Kumamori there is a story that it was written as "name cloud".

② Birth of Gunma-ken Shibukawa-shi Akagi-cho Nagai Komagata (old: Nanun) A place name with a record since the Muromachi period. The place name was also written as "Nanao". There is also a passage that there is a designation of "Naguma (Naguma)" in place name.