Etymology and distribution of 富枡.

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

Gunma-ken Maebashi-shi . A variant of 日下部 . Because it is similar in vertical writing. Saitama-ken Minamisaitama-gun Miyashiro-machi Mr. Kusakabe of Wada said that it was described as "early part" in the Edo period.

※ There is a record written as "early part" by Oshita-ken (formerly Bungo country) with the Kusakabe surname corrected in 1032 (Yuan 5 years). 日下部 Kusakabe reference.