Etymology and distribution of 国天.

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

Kanagawa-ken Odawara-shi , Toukyou-to , Ishikawa-ken .

① Convention . Abbreviation of Sawaura. Kanagawa-ken Ashigarakami-gun Yamakita -machi When Kawamura Castle that was in Yamakita falls, Mr. Sawaura disguises it as a camouflage and remodeled "Sawa". Estimated in the Azuchi Momoyama period. It was in Shizuoka-ken Hamamatsu-shi during the Edo period. 沢浦 Sawaura reference.

② Topography . From the land of Sawa. Ishikawa-ken Hakusan-shi Distributed in Ishi-Town.

※ Shizuoka-ken Mishima-shi Sawajiri (Sawasi) is a place name with a record since the Sengoku period. The place name was also written as "Sawaji".