Tsubokawa 【坪川】5 The Japanese surnames etymology dictionary.
Toukyou-to , Kanagawa-ken , Nagano-ken Suwa-gun Hara-mura . Terrain . From a long forest. Ishikawa-ken Kanazawa-shi Marunouchi was in the Edo era at the Kaga clan in the Clan office. Kagawa-ken Ayauta-gun Ayagawa-chou It was in the Edo period under the feather . Tell the story that the neighborhood was called "Nagayashi".