Save Type Surname Usage Japanese (Rare) Scripts 外当, 外當(Japanese Kanji) そととう(Japanese Hiragana) Pronounced Pron. /so̞.to̞.to̞ː/ [key·simplify] Other Forms FormsSototo, Sototou, Sototoh Meaning & History Variant reading of Japanese Kanji 外当 or 外當 (see Hokaatari).