Jakotsubā is a name based on the image and brief note in Toriyama Sekien’s Konjaku Hyakki Shūi (late 18th century), without any specific oral tradition attached. The picture shows an old woman wreathed in snakes. The note mentions the Shanhai Jing’s account of the Wuxian people in the Overseas West Classic, citing those who hold a blue snake in the right hand and a red snake in the left, yet it stops short of directly identifying this old woman. The term itself appears in early modern chapbooks and theater as a derogatory label for an old woman, which Sekien likely molded into a yokai. Later encyclopedias claim she is the wife of “Snake Goemon,” that the blue snake freezes and the red snake burns, but these are embellishments inspired by Sekien’s wording, not grounded in cited tradition. Folklorically it visually aligns with the lineages of “oni-baba” and “snake bride,” but because no rites, taboos, or place-names unique to Jakotsubā are identified, academic treatments handle it as source-undetermined.