Segoe Kensaku (瀬越 憲作, Segoe Kensaku; May 22, 1889 – July 27, 1972) was a professional Go player. (His surname is occasionally given as Segoshi, but that appears to be a misreading, even if attested by furigana in some books he authored.)
Source: “Kensaku Segoe”, English Wikipedia (CC BY-SA 4.0), excerpt