Etymology and distribution of 栃羽.

Tochiba 【栃羽】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Chiba-ken , Saitama-ken . Chiba-ken Kashiwa-shi Born of Hananoi. A place name with a record since the Edo period. In Saitama-ken Kawaguchi-shi Edo period, it says that it was described as "Hanai", "Hananoi". 花井 Hanai reference.