Mogami Tokunai
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In this Japanese name, the surname is Mogami.
Mogami Tokunai (最上 徳内, c. 1755 – October 14, 1836) was a Japanese samurai, geographer and explorer.
Mogami was born in Dewa Province in what is now part of Yamagata Prefecture).[1]
He explored and mapped Hokkaido and Sakhalin and some of the Kuril Islands in 1785–1786. In his reports to the Tokugawa shogunate, he emphasized the need to defend the islands.[1] He compiled a preliminary Ainu-Japanese dictionary in Ezo Soshi.