Sōichi Kakeya (掛谷 宗一, Kakeya Sōichi; January 18, 1886 – January 9, 1947) was a Japanese mathematician who worked mainly in mathematical analysis and who posed the Kakeya problem and solved a version of the transportation problem. He received the Imperial Prize of the Japan Academy in 1928, and was elected to the Japan Academy in 1934.
Source: “Sōichi Kakeya”, English Wikipedia (CC BY-SA 4.0), excerpt